From: Richard Weinberger richard@nod.at
[ Upstream commit 37f31b6ca4311b94d985fb398a72e5399ad57925 ]
The requested device name can be NULL or an empty string. Check for that and refuse to continue. UBIFS has to do this manually since we cannot use mount_bdev(), which checks for this condition.
Fixes: 1e51764a3c2ac ("UBIFS: add new flash file system") Reported-by: syzbot+38bd0f7865e5c6379280@syzkaller.appspotmail.com Signed-off-by: Richard Weinberger richard@nod.at Signed-off-by: Sasha Levin alexander.levin@microsoft.com --- fs/ubifs/super.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index c5466c70d620..2a82aeeacba5 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1929,6 +1929,9 @@ static struct ubi_volume_desc *open_ubi(const char *name, int mode) int dev, vol; char *endptr;
+ if (!name || !*name) + return ERR_PTR(-EINVAL); + /* First, try to open using the device node path method */ ubi = ubi_open_volume_path(name, mode); if (!IS_ERR(ubi))