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: 801c135c ("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>
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