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[80.145.89.241]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3824af06e02sm517377f8f.32.2024.11.18.03.20.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 18 Nov 2024 03:20:10 -0800 (PST) From: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] iio: adc: ad7124: Refuse invalid input specifiers Date: Mon, 18 Nov 2024 12:19:56 +0100 Message-ID: X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2144; i=u.kleine-koenig@baylibre.com; h=from:subject:message-id; bh=gkebMvifaHHqYyg3wApsDhnNPWqEu8s40kTTe7mYLOw=; b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBnOyLfGsCIByaVZGarVHFl3mkS+B0/j1LFfwxB1 8fYuZZ1IT+JATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCZzsi3wAKCRCPgPtYfRL+ Ts+bCACIz+mk+hqNkhtGHLZ6hP8yd0qzFgyJFsUKKkzO536lI8s6cM4YJbIpKlRBwMrlDULO0Nk W6FItS/1LvFpl35M6Ea3q8CiZhf4W7CRKrQqxGzpGYis/jBD79JQXQAIUm5211E7yRJz1adqSwA +sKLNn1aZKg0uCJmQY25DtAnXcm1L8oVeXxLYp/cYHJ7bec5ea8Kn/2aL8RhTyccE7K07BF+x2k Tw2lXhP0I7yR12eLck5B7bCtA+aOjzkGhQ4Z/3vejJNjkOyq9NM9+tgTMzEnU7yq5DRCgN8g7Hm wL9JCgOcR39Zp5/qVMyWBn7ODUZyjNXbpS7LEuo1p/VOZ2+B X-Developer-Key: i=u.kleine-koenig@baylibre.com; a=openpgp; fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6 The ad7124-4 has 8 analog inputs; the input select values 8 to 15 are reserved and not to be used. These are fine for ad7124-8. For both ad7124-4 and ad7124-8 values bigger than 15 are internal channels that might appear as inputs in the channels specified in the device description according to the description of commit f1794fd7bdf7 ("iio: adc: ad7124: Remove input number limitation"), values bigger than 31 don't fit into the respective register bit field and the driver masked them to smaller values. Check for these invalid input specifiers and fail to probe if one is found. Fixes: f1794fd7bdf7 ("iio: adc: ad7124: Remove input number limitation") Signed-off-by: Uwe Kleine-König --- drivers/iio/adc/ad7124.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c index 4de69bb8653a..bfeec59e33ba 100644 --- a/drivers/iio/adc/ad7124.c +++ b/drivers/iio/adc/ad7124.c @@ -807,6 +807,19 @@ static int ad7124_check_chip_id(struct ad7124_state *st) return 0; } +/* + * Input specifiers 8 - 15 are explicitly reserved for ad7124-4 + * while they are fine for ad7124-8. Values above 31 don't fit + * into the register field and so are invalid for sure. + */ +static bool ad7124_valid_input_select(unsigned int ain, const struct ad7124_chip_info *info) +{ + if (ain >= info->num_inputs && ain < 16) + return false; + + return ain <= FIELD_MAX(AD7124_CHANNEL_AINM_MSK); +} + static int ad7124_parse_channel_config(struct iio_dev *indio_dev, struct device *dev) { @@ -859,6 +872,11 @@ static int ad7124_parse_channel_config(struct iio_dev *indio_dev, if (ret) return ret; + if (!ad7124_valid_input_select(ain[0], st->chip_info) || + !ad7124_valid_input_select(ain[1], st->chip_info)) + return dev_err_probe(dev, -EINVAL, + "diff-channels property of %pfwP contains invalid data\n", child); + st->channels[channel].nr = channel; st->channels[channel].ain = AD7124_CHANNEL_AINP(ain[0]) | AD7124_CHANNEL_AINM(ain[1]);