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iio: imu: st_lsm6dsx: fix possible lockup in st_lsm6dsx_read_tagged_fifo

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commit 8114ef86e2058e2554111b793596f17bee23fa15 upstream.

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: 801a6e0af0 ("iio: imu: st_lsm6dsx: add support to LSM6DSO")
Signed-off-by: Silvano Seva <s.seva@4sigma.it>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://patch.msgid.link/20250311085030.3593-4-s.seva@4sigma.it
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Silvano Seva
2025-03-11 09:49:49 +01:00
committed by Greg Kroah-Hartman
parent a1cad8a3bc
commit dadf911610
1 changed files with 3 additions and 0 deletions
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3
drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
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@@ -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,