From: Richard Weinberger <richard@xxxxxx>
[ 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@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Richard Weinberger <richard@xxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
---
fs/ubifs/super.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index e1cd3dcf5a03..ad827cf642fe 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1930,6 +1930,9 @@ 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))
--
2.17.1
