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authorYang Yingliang <yangyingliang@huawei.com>2022-11-14 18:26:24 +0800
committerRichard Weinberger <richard@nod.at>2023-02-02 21:13:44 +0100
commitc15859bfd326c10230f09cb48a17f8a35f190342 (patch)
treebe27a1a776049089639e838d11ff06f95048160d /drivers/ptp
parent7af73882dd1cea5d32ac0cc9eda263635295de50 (diff)
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ubi: Fix possible null-ptr-deref in ubi_free_volume()
It willl cause null-ptr-deref in the following case: uif_init() ubi_add_volume() cdev_add() -> if it fails, call kill_volumes() device_register() kill_volumes() -> if ubi_add_volume() fails call this function ubi_free_volume() cdev_del() device_unregister() -> trying to delete a not added device, it causes null-ptr-deref So in ubi_free_volume(), it delete devices whether they are added or not, it will causes null-ptr-deref. Handle the error case whlie calling ubi_add_volume() to fix this problem. If add volume fails, set the corresponding vol to null, so it can not be accessed in kill_volumes() and release the resource in ubi_add_volume() error path. Fixes: 801c135ce73d ("UBI: Unsorted Block Images") Suggested-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers/ptp')
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