From patchwork Thu Oct 3 17:34:08 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Matteo Martelli X-Patchwork-Id: 13821307 Received: from mail-wm1-f50.google.com (mail-wm1-f50.google.com [209.85.128.50]) (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 5F7CC1AB53A; Thu, 3 Oct 2024 17:34:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.50 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727976889; cv=none; b=mdEKsJdCWlUSzZ5kKB9n26MVa7KJjGGF2seqv8EYVMnUq1GC7jXbyy0MzHVt8bOTJGtjwD4H9T00Lp17fmy371SenAL/6KNByASNssUU2PWVtbTcdUFDjdayV1a6b1G/xSL5VaA/ZPhbMxm25vPZnDq9Qb5o9A4PEif2vR1KngE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727976889; c=relaxed/simple; bh=2/hMSftv+3dvVX2Wa2Ap1k9j9lysmFSfimPuu4XRnro=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=JPRrCQl2KtYA9iKlqINxbdf7MTnoKQWiOTzagBosNrhVbnAElCowcSQvZoUSlGbyQuCY3v3kLAE/tqtWZFWJcS0gvoWdtFcOvg1l5KK+eXXh9VzdsTxrZDuqgtXh9mhLFGItqDNIIskXbP4c2q4hY367l/e/RgI8rgMUxMp4Ayg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=MxGq9tQh; arc=none smtp.client-ip=209.85.128.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="MxGq9tQh" Received: by mail-wm1-f50.google.com with SMTP id 5b1f17b1804b1-42cb5b3c57eso11706975e9.2; Thu, 03 Oct 2024 10:34:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1727976886; x=1728581686; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=MTXdcjBlauvr7yxzI4HI4Dpu0RqCMP0lDL0VjxoSP1k=; b=MxGq9tQhXI+DrfmUcZVXhtSBWJY5fQgH8UBmUV7kPegnQcMRisLJIm/LZnj5t4WZB4 Xsrt+DLlfj6QkIXsACokxLLsVV2qlGO2NvKxHE1YaycS8MECBNeWOXLkyZLOcm5aY6Zt RbXVBeh87df6rhWZXglzoj+hs2EmZE8lZSTD1YdHKezrxnLqcXECWB3HG+VU+MAoSSGV YSSO3leL+si09yagwyXtZT1RYppI1uPCXmCAZKkUx89wBdFGEQYfwHhQn9j3//mTuy/u Uo2u52CgMsZyc9c71PA9QgzNb+fZgTRrGLJEomaRXq9/3KnM/+3JQa5Ep8FHCqhahHVh 8UfQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727976886; x=1728581686; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=MTXdcjBlauvr7yxzI4HI4Dpu0RqCMP0lDL0VjxoSP1k=; b=ktjr0zDj2d/GhpZ/aiOZHedi0WeWM1kfVerVzprNE8bLWZWB9amNiIv8v3nyb/Ywy5 B9C39p3iVUh0SBk+4CTWaT3O/NSWyO7Q0b3YwLd1nx63dHnPH3RL6+s+mkdNg9ALxvJJ KXG+SG6+HZj+4ofoOgHkL7YAqLYYf9L82UIcy98tBvFceEBTHi2ReuahH5/fpzsHJ1GD D6H3IJ8bxspi/NCETcQlbqfihr0pIwzCRbEBtUclv6pIgnRPturfBX7vEZU/KrneR6Mm vAA6FiXEoc2edH46xFpMLZGFCvheVjq/52TpBAyVg5jaH9lDU9Uj9MHxfZkF/lL4N1Nt jVVQ== X-Forwarded-Encrypted: i=1; AJvYcCUqDLoxPAqgazf+LA+TahULT6Ns/dZvO8v4keJZMFJ+P4JgYha3j/v0sPL9zNl7QeGIAZ5Ggz5Fc/E=@vger.kernel.org, AJvYcCVLoEiLOaa5z7RWo+bp4aYFF8Pnxk4XSxStO6BkbTw628IhdJk2uLrBh55HMx2SumiD4Ire4APgPb+8E2k=@vger.kernel.org, AJvYcCXzZgLcPLmZ4JBPvHAl/gc4ZVZtVxZAYDhQcM766R9NxgTEZOvI16IYCzH8ztR3yRnyyPAK1vjcnrN71A==@vger.kernel.org X-Gm-Message-State: AOJu0YyIwMuPGsaeJnQqTos2wvKHpMDzZOJGWc6gf8x5t5I8Xg/bVnTF K7VcIJC32YxiFwsjEOa9KJn/011MFPWWqX/F/e+G1D1km1zqHfKw X-Google-Smtp-Source: AGHT+IHn6LdeRuDWE8fHAt/wjcTUVQYdBz6//TPcMWsGZOuJa319SrxzZL9LhUsa2CXPwqGuJroUHA== X-Received: by 2002:a05:600c:3b8a:b0:42c:b309:8d1a with SMTP id 5b1f17b1804b1-42f777bac51mr58068895e9.13.1727976885467; Thu, 03 Oct 2024 10:34:45 -0700 (PDT) Received: from localhost (host-79-19-52-27.retail.telecomitalia.it. [79.19.52.27]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42f8025b50bsm20382895e9.17.2024.10.03.10.34.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Oct 2024 10:34:43 -0700 (PDT) From: Matteo Martelli Date: Thu, 03 Oct 2024 19:34:08 +0200 Subject: [PATCH 3/7] iio: ad7192: copy/release available filter frequencies to fix race Precedence: bulk X-Mailing-List: linux-mips@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241003-iio-read-avail-release-v1-3-c70cc7d9c2e0@gmail.com> References: <20241003-iio-read-avail-release-v1-0-c70cc7d9c2e0@gmail.com> In-Reply-To: <20241003-iio-read-avail-release-v1-0-c70cc7d9c2e0@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,