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peci: cpu: Fix use-after-free in adev_release()

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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
This commit is contained in:
Iwona Winiarska 2022-07-05 12:15:01 +02:00
parent e79b548b72
commit 1c11289b34
1 changed files with 1 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

3
drivers/peci/cpu.c
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@ -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)