diff options
| author | Iwona Winiarska <iwona.winiarska@intel.com> | 2022-07-05 12:15:01 +0200 |
|---|---|---|
| committer | Iwona Winiarska <iwona.winiarska@intel.com> | 2022-08-15 20:31:35 +0200 |
| commit | 1c11289b34ab67ed080bbe0f1855c4938362d9cf (patch) | |
| tree | 710ed11c919133f7bfdc33d0a523f5d1730567b1 /drivers/peci | |
| parent | e79b548b7202bb3accdfe64f113129a4340bc2f9 (diff) | |
peci: cpu: Fix use-after-free in adev_release()
When auxiliary_device_add() returns an error, auxiliary_device_uninit()
is called, which causes refcount for device to be decremented and
.release callback will be triggered.
Because adev_release() re-calls auxiliary_device_uninit(), it will cause
use-after-free:
[ 1269.455172] WARNING: CPU: 0 PID: 14267 at lib/refcount.c:28 refcount_warn_saturate+0x110/0x15
[ 1269.464007] refcount_t: underflow; use-after-free.
Reported-by: Jianglei Nie <niejianglei2021@163.com>
Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com>
Link: https://lore.kernel.org/r/20220705101501.298395-1-iwona.winiarska@intel.com
Diffstat (limited to 'drivers/peci')
| -rw-r--r-- | drivers/peci/cpu.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/peci/cpu.c b/drivers/peci/cpu.c index 68eb61c65d34..de4a7b3e5966 100644 --- a/drivers/peci/cpu.c +++ b/drivers/peci/cpu.c @@ -188,8 +188,6 @@ static void adev_release(struct device *dev) { struct auxiliary_device *adev = to_auxiliary_dev(dev); - auxiliary_device_uninit(adev); - kfree(adev->name); kfree(adev); } @@ -234,6 +232,7 @@ static void unregister_adev(void *_adev) struct auxiliary_device *adev = _adev; auxiliary_device_delete(adev); + auxiliary_device_uninit(adev); } static int devm_adev_add(struct device *dev, int idx) |