linux-kernel - [PATCH v3 2/2] iio: imu: st_lsm6dsx: fix possible lockup in st_lsm6dsx_read_tagged

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Message-ID: <20250311085030.3593-4-s.seva@4sigma.it>
Date: Tue, 11 Mar 2025 09:49:49 +0100
From: Silvano Seva <s.seva@...gma.it>
To: jic23@...nel.org
Cc: a.greco@...gma.it,
	Silvano Seva <s.seva@...gma.it>,
	Lorenzo Bianconi <lorenzo@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/2] iio: imu: st_lsm6dsx: fix possible lockup in st_lsm6dsx_read_tagged_fifo

Prevent st_lsm6dsx_read_tagged_fifo from falling in an infinite loop in
case pattern_len is equal to zero and the device FIFO is not empty.

Fixes: 801a6e0af0c6 ("iio: imu: st_lsm6dsx: add support to LSM6DSO")
Signed-off-by: Silvano Seva <s.seva@...gma.it>
---

Changes since v1:
* st_lsm6dsx_read_fifo: moved check for zero pattern_len before fifo_len assignment
* st_lsm6dsx_read_fifo: dropped check for zero fifo_len
* added Fixes tags in commit message

Changes since v2:
* split patch in two parts, one fixing st_lsm6dsx_read_fifo and one fixing
st_lsm6dsx_read_tagged_fifo

 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
index 480a9b31065c..8a9d2593576a 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -626,6 +626,9 @@ int st_lsm6dsx_read_tagged_fifo(struct st_lsm6dsx_hw *hw)
 	if (!fifo_len)
 		return 0;
 
+	if (!pattern_len)
+		pattern_len = ST_LSM6DSX_TAGGED_SAMPLE_SIZE;
+
 	for (read_len = 0; read_len < fifo_len; read_len += pattern_len) {
 		err = st_lsm6dsx_read_block(hw,
 					    ST_LSM6DSX_REG_FIFO_OUT_TAG_ADDR,
-- 
2.48.1