| From: Richard Weinberger <richard@nod.at> |
| Date: Mon, 3 Sep 2018 23:06:23 +0200 |
| Subject: ubifs: Check for name being NULL while mounting |
| |
| commit 37f31b6ca4311b94d985fb398a72e5399ad57925 upstream. |
| |
| 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: Ben Hutchings <ben@decadent.org.uk> |
| --- |
| fs/ubifs/super.c | 3 +++ |
| 1 file changed, 3 insertions(+) |
| |
| --- a/fs/ubifs/super.c |
| +++ b/fs/ubifs/super.c |
| @@ -1917,6 +1917,9 @@ static struct ubi_volume_desc *open_ubi( |
| 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)) |
