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Thu, 30 Apr 2026 06:29:14 -0700 (PDT) Received: from junjungu-PC.localdomain ([223.166.246.30]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-834ed6dd823sm5518855b3a.38.2026.04.30.06.29.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Apr 2026 06:29:13 -0700 (PDT) From: Felix Gu Date: Thu, 30 Apr 2026 21:29:06 +0800 Subject: [PATCH v2] iio: buffer: hw-consumer: fix use-after-free in error path Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260430-iio-buf-v2-1-84c2231dea5e@gmail.com> X-B4-Tracking: v=1; b=H4sIACFZ82kC/2XMQQ7CIBCF4as0s3YMIFR05T1MF5RCO4ktDSjRN Nxd7Nbl//LybZBcJJfg2mwQXaZEYakhDg3YySyjQxpqg2CiZVJoJArYvzxKq5W6MMGMklDfa3S e3rt072pPlJ4hfnY489/6b2SOHAdr25P3514zdhtnQ4+jDTN0pZQvljfw454AAAA= X-Change-ID: 20260428-iio-buf-4c8559020a54 To: Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Lars-Peter Clausen , Arnaud Pouliquen , Mark Brown Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Jonathan Cameron , sashiko , Felix Gu X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1777555750; l=1953; i=ustc.gu@gmail.com; h=from:subject:message-id; bh=+T7FgV1mogHrRsPMhZRBIlCYy4ttKhXCc1OP4y+pAZY=; b=od3ODozzIleYJiaARpw3ZND1sfhIis5Mt6qAuvw064lIYDsrT8UrraPOWadVXIkEC9U7T3VbF jwB2Uvk0E7rAKWf/t6iqZIctw22BHdKPtJ5wuQ7uO6Nbbtu68CL8REw X-Developer-Key: i=ustc.gu@gmail.com; a=ed25519; pk=fjUXwmjchVN7Ja6KGP55IXOzFeCl9edaHoQIEUA+/hw= In the err_put_buffers cleanup path of iio_hw_consumer_alloc(), the code was using list_for_each_entry() to iterate through buffers while calling iio_buffer_put() which can free the current buffer if refcount drops to 0. The list_for_each_entry() loop macro then evaluates buf->head.next to continue iteration, accessing the freed buffer. Fix this by using list_for_each_entry_safe(). Fixes: 48b66f8f936f ("iio: Add hardware consumer buffer support") Reported-by: sashiko Closes: https://sashiko.dev/#/patchset/20260427-iio_buf-v1-1-2bbdac844647%40gmail.com Signed-off-by: Felix Gu --- Changes in v2: - Fix Andy's comment. - Add Reported-by tag. - Link to v1: https://lore.kernel.org/r/20260428-iio-buf-v1-1-dcc63ff7b800@gmail.com --- drivers/iio/buffer/industrialio-hw-consumer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/iio/buffer/industrialio-hw-consumer.c b/drivers/iio/buffer/industrialio-hw-consumer.c index 24d7df603760..700528c9a0a4 100644 --- a/drivers/iio/buffer/industrialio-hw-consumer.c +++ b/drivers/iio/buffer/industrialio-hw-consumer.c @@ -85,7 +85,7 @@ static struct hw_consumer_buffer *iio_hw_consumer_get_buffer( */ struct iio_hw_consumer *iio_hw_consumer_alloc(struct device *dev) { - struct hw_consumer_buffer *buf; + struct hw_consumer_buffer *buf, *tmp; struct iio_hw_consumer *hwc; struct iio_channel *chan; int ret; @@ -116,7 +116,7 @@ struct iio_hw_consumer *iio_hw_consumer_alloc(struct device *dev) return hwc; err_put_buffers: - list_for_each_entry(buf, &hwc->buffers, head) + list_for_each_entry_safe(buf, tmp, &hwc->buffers, head) iio_buffer_put(&buf->buffer); iio_channel_release_all(hwc->channels); err_free_hwc: --- base-commit: 7080e32d3f09d8688c4a87d81bdcc71f7f606b16 change-id: 20260428-iio-buf-4c8559020a54 Best regards, -- Felix Gu