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| author | Teng Qi <starmiku1207184332@gmail.com> | 2021-10-11 19:40:03 +0800 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2021-10-20 14:43:53 +0100 |
| commit | 94be878c882d8d784ff44c639bf55f3b029f85af (patch) | |
| tree | ed03a13a8294304a4eb145d7dc85eec9e59032ce /drivers/iio/imu | |
| parent | 77b91b1cbc26f2d7eebe7294035325076de6e1cc (diff) | |
| download | linux-94be878c882d8d784ff44c639bf55f3b029f85af.tar.gz linux-94be878c882d8d784ff44c639bf55f3b029f85af.tar.bz2 linux-94be878c882d8d784ff44c639bf55f3b029f85af.zip | |
iio: imu: st_lsm6dsx: Avoid potential array overflow in st_lsm6dsx_set_odr()
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>
Diffstat (limited to 'drivers/iio/imu')
| -rw-r--r-- | drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 6 |
1 files 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 0f54df85134a..f2cbbc756459 100644 --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c @@ -1281,6 +1281,8 @@ st_lsm6dsx_set_odr(struct st_lsm6dsx_sensor *sensor, u32 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: @@ -1306,8 +1308,8 @@ st_lsm6dsx_set_odr(struct st_lsm6dsx_sensor *sensor, u32 req_odr) } break; } - default: - break; + default: /* should never occur */ + return -EINVAL; } if (req_odr > 0) { |