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[79.18.120.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37ecf027d90sm1547801f8f.8.2024.10.18.03.16.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 03:16:56 -0700 (PDT) From: Matteo Martelli Date: Fri, 18 Oct 2024 12:16:40 +0200 Subject: [PATCH v4 1/5] iio: core: add read_avail_release_resource callback to fix race Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241018-iio-read-avail-release-v4-1-53c8ac618585@gmail.com> References: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> In-Reply-To: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Alisa-Dariana Roman , Christian Eggers , Peter Rosin , Paul Cercueil , Sebastian Reichel Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-pm@vger.kernel.org, Matteo Martelli X-Mailer: b4 0.14.2 Some iio drivers currently share an available info buffer that might be changed while iio core prints it to sysfs. To avoid the buffer corruption, add a release callback to let iio drivers allocate a copy of the available info buffer and later free it in the release callback. Such control is kept in the driver logic so that some driver that needs a big available info buffer might also perform some check to keep the copied buffer around in case no race has occurred. Signed-off-by: Matteo Martelli --- drivers/iio/industrialio-core.c | 14 +++++++++++--- include/linux/iio/iio.h | 4 ++++ 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c index 6a6568d4a2cb3a3f63381d5a6f25a2881b3ba2ed..4aea9de9f15a4d70f9d02fb3d47df49eef8c8423 100644 --- a/drivers/iio/industrialio-core.c +++ b/drivers/iio/industrialio-core.c @@ -859,12 +859,20 @@ static ssize_t iio_read_channel_info_avail(struct device *dev, return ret; switch (ret) { case IIO_AVAIL_LIST: - return iio_format_avail_list(buf, vals, type, length); + ret = iio_format_avail_list(buf, vals, type, length); + break; case IIO_AVAIL_RANGE: - return iio_format_avail_range(buf, vals, type); + ret = iio_format_avail_range(buf, vals, type); + break; default: - return -EINVAL; + ret = -EINVAL; } + + if (indio_dev->info->read_avail_release_resource) + indio_dev->info->read_avail_release_resource( + indio_dev, this_attr->c, vals, this_attr->address); + + return ret; } /** diff --git a/include/linux/iio/iio.h b/include/linux/iio/iio.h index 3a9b57187a958d6e65c699cf7814df5bac9a99e3..03bb765670a0c5f0129fc677c3a4a4cb38f4dad1 100644 --- a/include/linux/iio/iio.h +++ b/include/linux/iio/iio.h @@ -491,6 +491,10 @@ struct iio_info { int *length, long mask); + void (*read_avail_release_resource)(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int *vals, long mask); + int (*write_raw)(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, From patchwork Fri Oct 18 10:16:41 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Martelli X-Patchwork-Id: 13841510 Received: from mail-wr1-f52.google.com (mail-wr1-f52.google.com [209.85.221.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 54445201251; Fri, 18 Oct 2024 10:17:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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[79.18.120.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-43160e4fe8bsm19734805e9.44.2024.10.18.03.16.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 03:16:57 -0700 (PDT) From: Matteo Martelli Date: Fri, 18 Oct 2024 12:16:41 +0200 Subject: [PATCH v4 2/5] iio: consumers: copy/release available info from producer to fix race Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241018-iio-read-avail-release-v4-2-53c8ac618585@gmail.com> References: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> In-Reply-To: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Alisa-Dariana Roman , Christian Eggers , Peter Rosin , Paul Cercueil , Sebastian Reichel Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-pm@vger.kernel.org, Matteo Martelli X-Mailer: b4 0.14.2 Consumers need to call the producer's read_avail_release_resource() callback after reading producer's available info. To avoid a race condition with the producer unregistration, change inkern iio_channel_read_avail() so that it copies the available info from the producer and immediately calls its release callback with info_exists locked. Also, modify the users of iio_read_avail_channel_raw() and iio_read_avail_channel_attribute() to free the copied available buffers after calling these functions. Signed-off-by: Matteo Martelli --- drivers/iio/afe/iio-rescale.c | 8 ++++++++ drivers/iio/dac/dpot-dac.c | 8 ++++++++ drivers/iio/inkern.c | 34 ++++++++++++++++++++++++++++------ drivers/iio/multiplexer/iio-mux.c | 8 ++++++++ drivers/power/supply/ingenic-battery.c | 4 +++- include/linux/iio/consumer.h | 4 ++-- 6 files changed, 57 insertions(+), 9 deletions(-) diff --git a/drivers/iio/afe/iio-rescale.c b/drivers/iio/afe/iio-rescale.c index 56e5913ab82d1c045c9ca27012008a4495502cbf..78bb86c291706748b4072a484532ad20c415ff9f 100644 --- a/drivers/iio/afe/iio-rescale.c +++ b/drivers/iio/afe/iio-rescale.c @@ -249,9 +249,17 @@ static int rescale_read_avail(struct iio_dev *indio_dev, } } +static void rescale_read_avail_release_res(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int *vals, long mask) +{ + kfree(vals); +} + static const struct iio_info rescale_info = { .read_raw = rescale_read_raw, .read_avail = rescale_read_avail, + .read_avail_release_resource = rescale_read_avail_release_res, }; static ssize_t rescale_read_ext_info(struct iio_dev *indio_dev, diff --git a/drivers/iio/dac/dpot-dac.c b/drivers/iio/dac/dpot-dac.c index f36f10bfb6be7863a56b911b5f58671ef530c977..43d68e17fc3a5fca59fad6ccf818eeadfecdb8c1 100644 --- a/drivers/iio/dac/dpot-dac.c +++ b/drivers/iio/dac/dpot-dac.c @@ -108,6 +108,13 @@ static int dpot_dac_read_avail(struct iio_dev *indio_dev, return -EINVAL; } +static void dpot_dac_read_avail_release_res(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int *vals, long mask) +{ + kfree(vals); +} + static int dpot_dac_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) @@ -125,6 +132,7 @@ static int dpot_dac_write_raw(struct iio_dev *indio_dev, static const struct iio_info dpot_dac_info = { .read_raw = dpot_dac_read_raw, .read_avail = dpot_dac_read_avail, + .read_avail_release_resource = dpot_dac_read_avail_release_res, .write_raw = dpot_dac_write_raw, }; diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index 7f325b3ed08fae6674245312cf8f57bb151006c0..9af6b33eb8d178ee7b3f5d417ccfa4d0f87835bc 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -760,9 +760,29 @@ static int iio_channel_read_avail(struct iio_channel *chan, if (!iio_channel_has_available(chan->channel, info)) return -EINVAL; - if (iio_info->read_avail) - return iio_info->read_avail(chan->indio_dev, chan->channel, - vals, type, length, info); + if (iio_info->read_avail) { + const int *vals_tmp; + int ret; + + ret = iio_info->read_avail(chan->indio_dev, chan->channel, + &vals_tmp, type, length, info); + if (ret < 0) + return ret; + + /* + * Copy the producer's avail buffer with lock_exists locked to + * avoid possible race with producer unregistration. + */ + *vals = kmemdup_array(vals_tmp, *length, sizeof(int), GFP_KERNEL); + if (!*vals) + return -ENOMEM; + + if (iio_info->read_avail_release_resource) + iio_info->read_avail_release_resource( + chan->indio_dev, chan->channel, vals_tmp, info); + + return ret; + } return -EINVAL; } @@ -789,9 +809,11 @@ int iio_read_avail_channel_raw(struct iio_channel *chan, ret = iio_read_avail_channel_attribute(chan, vals, &type, length, IIO_CHAN_INFO_RAW); - if (ret >= 0 && type != IIO_VAL_INT) + if (ret >= 0 && type != IIO_VAL_INT) { /* raw values are assumed to be IIO_VAL_INT */ + kfree(*vals); ret = -EINVAL; + } return ret; } @@ -801,7 +823,7 @@ static int iio_channel_read_max(struct iio_channel *chan, int *val, int *val2, int *type, enum iio_chan_info_enum info) { - const int *vals; + const int *vals __free(kfree) = NULL; int length; int ret; @@ -857,7 +879,7 @@ static int iio_channel_read_min(struct iio_channel *chan, int *val, int *val2, int *type, enum iio_chan_info_enum info) { - const int *vals; + const int *vals __free(kfree) = NULL; int length; int ret; diff --git a/drivers/iio/multiplexer/iio-mux.c b/drivers/iio/multiplexer/iio-mux.c index 2953403bef53bbe47a97a8ab1c475ed88d7f86d2..31345437784b01c5d6f8ea70263f4c2574388e7a 100644 --- a/drivers/iio/multiplexer/iio-mux.c +++ b/drivers/iio/multiplexer/iio-mux.c @@ -142,6 +142,13 @@ static int mux_read_avail(struct iio_dev *indio_dev, return ret; } +static void mux_read_avail_release_res(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int *vals, long mask) +{ + kfree(vals); +} + static int mux_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) @@ -171,6 +178,7 @@ static int mux_write_raw(struct iio_dev *indio_dev, static const struct iio_info mux_info = { .read_raw = mux_read_raw, .read_avail = mux_read_avail, + .read_avail_release_resource = mux_read_avail_release_res, .write_raw = mux_write_raw, }; diff --git a/drivers/power/supply/ingenic-battery.c b/drivers/power/supply/ingenic-battery.c index 0a40f425c27723ccec49985b8b5e14a737b6a7eb..6b7856e69f5fb7b8b73166b9b6825f4af7b19129 100644 --- a/drivers/power/supply/ingenic-battery.c +++ b/drivers/power/supply/ingenic-battery.c @@ -6,12 +6,14 @@ * based on drivers/power/supply/jz4740-battery.c */ +#include #include #include #include #include #include #include +#include struct ingenic_battery { struct device *dev; @@ -62,7 +64,7 @@ static int ingenic_battery_get_property(struct power_supply *psy, */ static int ingenic_battery_set_scale(struct ingenic_battery *bat) { - const int *scale_raw; + const int *scale_raw __free(kfree) = NULL; int scale_len, scale_type, best_idx = -1, best_mV, max_raw, i, ret; u64 max_mV; diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index 333d1d8ccb37f387fe531577ac5e0bfc7f752cec..e3e268d2574b3e01c9412449d90d627de7efcd84 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -316,7 +316,7 @@ int iio_read_min_channel_raw(struct iio_channel *chan, int *val); /** * iio_read_avail_channel_raw() - read available raw values from a given channel * @chan: The channel being queried. - * @vals: Available values read back. + * @vals: Available values read back. Must be freed after use. * @length: Number of entries in vals. * * Returns an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST. @@ -334,7 +334,7 @@ int iio_read_avail_channel_raw(struct iio_channel *chan, /** * iio_read_avail_channel_attribute() - read available channel attribute values * @chan: The channel being queried. - * @vals: Available values read back. + * @vals: Available values read back. Must be freed after use. * @type: Type of values read back. * @length: Number of entries in vals. * @attribute: info attribute to be read back. 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[79.18.120.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37ecf066600sm1522219f8f.37.2024.10.18.03.16.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 03:16:59 -0700 (PDT) From: Matteo Martelli Date: Fri, 18 Oct 2024 12:16:42 +0200 Subject: [PATCH v4 3/5] iio: pac1921: use read_avail+release APIs instead of custom ext_info Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241018-iio-read-avail-release-v4-3-53c8ac618585@gmail.com> References: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> In-Reply-To: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Alisa-Dariana Roman , Christian Eggers , Peter Rosin , Paul Cercueil , Sebastian Reichel Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-pm@vger.kernel.org, Matteo Martelli X-Mailer: b4 0.14.2 The pac1921 driver was exposing the available scale info via an ad-hoc ext_info attribute instead of using the read_avail API. This to avoid a possible race condition: while the available current scales were being printed to sysfs by iio core (iio_read_channel_info_avail), the shunt resistor might have been changed concurrently. Switch to the read_avail+release APIs now that the race condition has been addressed. Signed-off-by: Matteo Martelli --- drivers/iio/adc/pac1921.c | 128 ++++++++++++++++------------------------------ 1 file changed, 45 insertions(+), 83 deletions(-) diff --git a/drivers/iio/adc/pac1921.c b/drivers/iio/adc/pac1921.c index a96fae546bc1e6d1bf3a0dbe67204c191d77a3ee..f6f8f9122a78d1b5e63d8184203eb3dae55eb560 100644 --- a/drivers/iio/adc/pac1921.c +++ b/drivers/iio/adc/pac1921.c @@ -444,11 +444,52 @@ static int pac1921_read_avail(struct iio_dev *indio_dev, *vals = pac1921_int_num_samples; *length = ARRAY_SIZE(pac1921_int_num_samples); return IIO_AVAIL_LIST; + case IIO_CHAN_INFO_SCALE: + switch (chan->channel) { + case PAC1921_CHAN_VBUS: + *vals = (const int *)pac1921_vbus_scales; + *length = ARRAY_SIZE(pac1921_vbus_scales) * 2; + *type = IIO_VAL_INT_PLUS_NANO; + return IIO_AVAIL_LIST; + + case PAC1921_CHAN_VSENSE: + *vals = (const int *)pac1921_vsense_scales; + *length = ARRAY_SIZE(pac1921_vsense_scales) * 2; + *type = IIO_VAL_INT_PLUS_NANO; + return IIO_AVAIL_LIST; + + case PAC1921_CHAN_CURRENT: { + struct pac1921_priv *priv = iio_priv(indio_dev); + + *length = ARRAY_SIZE(priv->current_scales) * 2; + *type = IIO_VAL_INT_PLUS_NANO; + + guard(mutex)(&priv->lock); + + *vals = kmemdup_array((int *)priv->current_scales, + *length, sizeof(int), GFP_KERNEL); + if (!*vals) + return -ENOMEM; + + return IIO_AVAIL_LIST; + } + default: + return -EINVAL; + } default: return -EINVAL; } } +static void pac1921_read_avail_release_res(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int *vals, long mask) +{ + if (mask == IIO_CHAN_INFO_SCALE && + chan->channel == PAC1921_CHAN_CURRENT) + kfree(vals); +} + /* * Perform configuration update sequence: set the device into read state, then * write the config register and set the device back into integration state. @@ -748,6 +789,7 @@ static int pac1921_read_event_value(struct iio_dev *indio_dev, static const struct iio_info pac1921_iio = { .read_raw = pac1921_read_raw, .read_avail = pac1921_read_avail, + .read_avail_release_resource = pac1921_read_avail_release_res, .write_raw = pac1921_write_raw, .write_raw_get_fmt = pac1921_write_raw_get_fmt, .read_label = pac1921_read_label, @@ -805,88 +847,7 @@ static ssize_t pac1921_write_shunt_resistor(struct iio_dev *indio_dev, return len; } -/* - * Emit on sysfs the list of available scales contained in scales_tbl - * - * TODO:: this function can be replaced with iio_format_avail_list() if the - * latter will ever be exported. - * - * Must be called with lock held if the scales_tbl can change runtime (e.g. for - * the current scales table) - */ -static ssize_t pac1921_format_scale_avail(const int (*const scales_tbl)[2], - size_t size, char *buf) -{ - ssize_t len = 0; - - for (unsigned int i = 0; i < size; i++) { - if (i != 0) { - len += sysfs_emit_at(buf, len, " "); - if (len >= PAGE_SIZE) - return -EFBIG; - } - len += sysfs_emit_at(buf, len, "%d.%09d", scales_tbl[i][0], - scales_tbl[i][1]); - if (len >= PAGE_SIZE) - return -EFBIG; - } - - len += sysfs_emit_at(buf, len, "\n"); - return len; -} - -/* - * Read available scales for a specific channel - * - * NOTE: using extended info insted of iio.read_avail() because access to - * current scales must be locked as they depend on shunt resistor which may - * change runtime. Caller of iio.read_avail() would access the table unlocked - * instead. - */ -static ssize_t pac1921_read_scale_avail(struct iio_dev *indio_dev, - uintptr_t private, - const struct iio_chan_spec *chan, - char *buf) -{ - struct pac1921_priv *priv = iio_priv(indio_dev); - const int (*scales_tbl)[2]; - size_t size; - - switch (chan->channel) { - case PAC1921_CHAN_VBUS: - scales_tbl = pac1921_vbus_scales; - size = ARRAY_SIZE(pac1921_vbus_scales); - return pac1921_format_scale_avail(scales_tbl, size, buf); - - case PAC1921_CHAN_VSENSE: - scales_tbl = pac1921_vsense_scales; - size = ARRAY_SIZE(pac1921_vsense_scales); - return pac1921_format_scale_avail(scales_tbl, size, buf); - - case PAC1921_CHAN_CURRENT: { - guard(mutex)(&priv->lock); - scales_tbl = priv->current_scales; - size = ARRAY_SIZE(priv->current_scales); - return pac1921_format_scale_avail(scales_tbl, size, buf); - } - default: - return -EINVAL; - } -} - -#define PAC1921_EXT_INFO_SCALE_AVAIL { \ - .name = "scale_available", \ - .read = pac1921_read_scale_avail, \ - .shared = IIO_SEPARATE, \ -} - -static const struct iio_chan_spec_ext_info pac1921_ext_info_voltage[] = { - PAC1921_EXT_INFO_SCALE_AVAIL, - {} -}; - static const struct iio_chan_spec_ext_info pac1921_ext_info_current[] = { - PAC1921_EXT_INFO_SCALE_AVAIL, { .name = "shunt_resistor", .read = pac1921_read_shunt_resistor, @@ -910,6 +871,7 @@ static const struct iio_chan_spec pac1921_channels[] = { .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + .info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | BIT(IIO_CHAN_INFO_SAMP_FREQ), @@ -927,12 +889,12 @@ static const struct iio_chan_spec pac1921_channels[] = { .indexed = 1, .event_spec = pac1921_overflow_event, .num_event_specs = ARRAY_SIZE(pac1921_overflow_event), - .ext_info = pac1921_ext_info_voltage, }, { .type = IIO_VOLTAGE, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + .info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | BIT(IIO_CHAN_INFO_SAMP_FREQ), @@ -950,12 +912,12 @@ static const struct iio_chan_spec pac1921_channels[] = { .indexed = 1, .event_spec = pac1921_overflow_event, .num_event_specs = ARRAY_SIZE(pac1921_overflow_event), - .ext_info = pac1921_ext_info_voltage, }, { .type = IIO_CURRENT, .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), + .info_mask_separate_available = BIT(IIO_CHAN_INFO_SCALE), .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO) | BIT(IIO_CHAN_INFO_SAMP_FREQ), From patchwork Fri Oct 18 10:16:43 2024 Content-Type: text/plain; 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[79.18.120.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37ecf089d52sm1543397f8f.61.2024.10.18.03.17.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 03:17:00 -0700 (PDT) From: Matteo Martelli Date: Fri, 18 Oct 2024 12:16:43 +0200 Subject: [PATCH v4 4/5] iio: ad7192: copy/release available filter frequencies to fix race Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241018-iio-read-avail-release-v4-4-53c8ac618585@gmail.com> References: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> In-Reply-To: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Alisa-Dariana Roman , Christian Eggers , Peter Rosin , Paul Cercueil , Sebastian Reichel Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-pm@vger.kernel.org, Matteo Martelli X-Mailer: b4 0.14.2 While available filter frequencies are being printed to sysfs by iio core (iio_read_channel_info_avail), the sampling frequency might be changed. This could cause the buffer shared with iio core to be corrupted. To prevent it, make a copy of the filter frequencies buffer and free it in the read_avail_release_resource callback. Signed-off-by: Matteo Martelli --- drivers/iio/adc/ad7192.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c index 7042ddfdfc03ee5ea58ca07fb1943feb6538175b..acf625ced0b21db8d44f77929e8a875b3c10e1b1 100644 --- a/drivers/iio/adc/ad7192.c +++ b/drivers/iio/adc/ad7192.c @@ -1056,12 +1056,19 @@ static int ad7192_read_avail(struct iio_dev *indio_dev, *length = ARRAY_SIZE(st->scale_avail) * 2; return IIO_AVAIL_LIST; - case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: - *vals = (int *)st->filter_freq_avail; + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: { *type = IIO_VAL_FRACTIONAL; *length = ARRAY_SIZE(st->filter_freq_avail) * 2; + guard(mutex)(&st->lock); + + *vals = kmemdup_array((int *)st->filter_freq_avail, *length, + sizeof(int), GFP_KERNEL); + if (!*vals) + return -ENOMEM; + return IIO_AVAIL_LIST; + } case IIO_CHAN_INFO_OVERSAMPLING_RATIO: *vals = (int *)st->oversampling_ratio_avail; *type = IIO_VAL_INT; @@ -1073,6 +1080,14 @@ static int ad7192_read_avail(struct iio_dev *indio_dev, return -EINVAL; } +static void ad7192_read_avail_release_res(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int *vals, long mask) +{ + if (mask == IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) + kfree(vals); +} + static int ad7192_update_scan_mode(struct iio_dev *indio_dev, const unsigned long *scan_mask) { struct ad7192_state *st = iio_priv(indio_dev); @@ -1098,6 +1113,7 @@ static const struct iio_info ad7192_info = { .write_raw = ad7192_write_raw, .write_raw_get_fmt = ad7192_write_raw_get_fmt, .read_avail = ad7192_read_avail, + .read_avail_release_resource = ad7192_read_avail_release_res, .attrs = &ad7192_attribute_group, .validate_trigger = ad_sd_validate_trigger, .update_scan_mode = ad7192_update_scan_mode, @@ -1108,6 +1124,7 @@ static const struct iio_info ad7194_info = { .write_raw = ad7192_write_raw, .write_raw_get_fmt = ad7192_write_raw_get_fmt, .read_avail = ad7192_read_avail, + .read_avail_release_resource = ad7192_read_avail_release_res, .validate_trigger = ad_sd_validate_trigger, }; @@ -1116,6 +1133,7 @@ static const struct iio_info ad7195_info = { .write_raw = ad7192_write_raw, .write_raw_get_fmt = ad7192_write_raw_get_fmt, .read_avail = ad7192_read_avail, + .read_avail_release_resource = ad7192_read_avail_release_res, .attrs = &ad7195_attribute_group, .validate_trigger = ad_sd_validate_trigger, .update_scan_mode = ad7192_update_scan_mode, From patchwork Fri Oct 18 10:16:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Martelli X-Patchwork-Id: 13841513 Received: from mail-wm1-f41.google.com (mail-wm1-f41.google.com [209.85.128.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EE6D420262F; Fri, 18 Oct 2024 10:17:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.41 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; 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[79.18.120.72]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-37ecf146e2asm1512707f8f.116.2024.10.18.03.17.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Oct 2024 03:17:01 -0700 (PDT) From: Matteo Martelli Date: Fri, 18 Oct 2024 12:16:44 +0200 Subject: [PATCH v4 5/5] iio: as73211: copy/release available integration times to fix race Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241018-iio-read-avail-release-v4-5-53c8ac618585@gmail.com> References: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> In-Reply-To: <20241018-iio-read-avail-release-v4-0-53c8ac618585@gmail.com> To: Jonathan Cameron , Lars-Peter Clausen , Michael Hennerich , Alisa-Dariana Roman , Christian Eggers , Peter Rosin , Paul Cercueil , Sebastian Reichel Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-pm@vger.kernel.org, Matteo Martelli X-Mailer: b4 0.14.2 While available integration times are being printed to sysfs by iio core (iio_read_channel_info_avail), the sampling frequency might be changed. This could cause the buffer shared with iio core to be corrupted. To prevent it, make a copy of the integration times buffer and free it in the read_avail_release_resource callback. Signed-off-by: Matteo Martelli --- drivers/iio/light/as73211.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/drivers/iio/light/as73211.c b/drivers/iio/light/as73211.c index be0068081ebbbb37fdfb252b67a77b302ff725f6..c4c94873e6a1cc926cfb724d906b07222773c43f 100644 --- a/drivers/iio/light/as73211.c +++ b/drivers/iio/light/as73211.c @@ -108,7 +108,8 @@ struct as73211_spec_dev_data { * @creg1: Cached Configuration Register 1. * @creg2: Cached Configuration Register 2. * @creg3: Cached Configuration Register 3. - * @mutex: Keeps cached registers in sync with the device. + * @mutex: Keeps cached registers in sync with the device and protects + * int_time_avail concurrent access for updating and reading. * @completion: Completion to wait for interrupt. * @int_time_avail: Available integration times (depend on sampling frequency). * @spec_dev: device-specific configuration. @@ -493,17 +494,32 @@ static int as73211_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec co *type = IIO_VAL_INT; return IIO_AVAIL_LIST; - case IIO_CHAN_INFO_INT_TIME: + case IIO_CHAN_INFO_INT_TIME: { *length = ARRAY_SIZE(data->int_time_avail); - *vals = data->int_time_avail; *type = IIO_VAL_INT_PLUS_MICRO; - return IIO_AVAIL_LIST; + guard(mutex)(&data->mutex); + + *vals = kmemdup_array(data->int_time_avail, *length, + sizeof(int), GFP_KERNEL); + if (!*vals) + return -ENOMEM; + + return IIO_AVAIL_LIST; + } default: return -EINVAL; } } +static void as73211_read_avail_release_res(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int *vals, long mask) +{ + if (mask == IIO_CHAN_INFO_INT_TIME) + kfree(vals); +} + static int _as73211_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan __always_unused, int val, int val2, long mask) @@ -699,6 +715,7 @@ static irqreturn_t as73211_trigger_handler(int irq __always_unused, void *p) static const struct iio_info as73211_info = { .read_raw = as73211_read_raw, .read_avail = as73211_read_avail, + .read_avail_release_resource = as73211_read_avail_release_res, .write_raw = as73211_write_raw, };