Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.4 27/30] iio: imu: st_lsm6dsx: Avoid potential array overflow in st_lsm6dsx_set_odr() | Date | Tue, 9 Nov 2021 17:22:21 -0500 |
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From: Teng Qi <starmiku1207184332@gmail.com>
[ Upstream commit 94be878c882d8d784ff44c639bf55f3b029f85af ]
The length of hw->settings->odr_table is 2 and ref_sensor->id is an enum variable whose value is between 0 and 5. However, the value ST_LSM6DSX_ID_MAX (i.e. 5) is not caught properly in switch (sensor->id) {
If ref_sensor->id is ST_LSM6DSX_ID_MAX, an array overflow will ocurrs in function st_lsm6dsx_check_odr(): odr_table = &sensor->hw->settings->odr_table[sensor->id];
and in function st_lsm6dsx_set_odr(): reg = &hw->settings->odr_table[ref_sensor->id].reg;
To avoid this array overflow, handle ST_LSM6DSX_ID_GYRO explicitly and return -EINVAL for the default case.
The enum value ST_LSM6DSX_ID_MAX is only present as an easy way to check the limit and as such is never used, however this is not locally obvious.
Reported-by: TOTE Robot <oslab@tsinghua.edu.cn> Signed-off-by: Teng Qi <starmiku1207184332@gmail.com> Acked-by: Lorenzo Bianconi <lorenzo@kernel.org> Link: https://lore.kernel.org/r/20211011114003.976221-1-starmiku1207184332@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c index 057a4b0100106..8850da8e25d69 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c @@ -1015,6 +1015,8 @@ static int st_lsm6dsx_set_odr(struct st_lsm6dsx_sensor *sensor, u16 req_odr) int err; switch (sensor->id) { + case ST_LSM6DSX_ID_GYRO: + break; case ST_LSM6DSX_ID_EXT0: case ST_LSM6DSX_ID_EXT1: case ST_LSM6DSX_ID_EXT2: @@ -1040,8 +1042,8 @@ static int st_lsm6dsx_set_odr(struct st_lsm6dsx_sensor *sensor, u16 req_odr) } break; } - default: - break; + default: /* should never occur */ + return -EINVAL; } if (req_odr > 0) { -- 2.33.0
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