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Commit | Line | Data |
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54545ec3 GKH |
1 | From 37f31b6ca4311b94d985fb398a72e5399ad57925 Mon Sep 17 00:00:00 2001 |
2 | From: Richard Weinberger <richard@nod.at> | |
3 | Date: Mon, 3 Sep 2018 23:06:23 +0200 | |
4 | Subject: ubifs: Check for name being NULL while mounting | |
5 | ||
6 | From: Richard Weinberger <richard@nod.at> | |
7 | ||
8 | commit 37f31b6ca4311b94d985fb398a72e5399ad57925 upstream. | |
9 | ||
10 | The requested device name can be NULL or an empty string. | |
11 | Check for that and refuse to continue. UBIFS has to do this manually | |
12 | since we cannot use mount_bdev(), which checks for this condition. | |
13 | ||
14 | Fixes: 1e51764a3c2ac ("UBIFS: add new flash file system") | |
15 | Reported-by: syzbot+38bd0f7865e5c6379280@syzkaller.appspotmail.com | |
16 | Signed-off-by: Richard Weinberger <richard@nod.at> | |
17 | Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
18 | ||
19 | --- | |
20 | fs/ubifs/super.c | 3 +++ | |
21 | 1 file changed, 3 insertions(+) | |
22 | ||
23 | --- a/fs/ubifs/super.c | |
24 | +++ b/fs/ubifs/super.c | |
25 | @@ -1929,6 +1929,9 @@ static struct ubi_volume_desc *open_ubi( | |
26 | int dev, vol; | |
27 | char *endptr; | |
28 | ||
29 | + if (!name || !*name) | |
30 | + return ERR_PTR(-EINVAL); | |
31 | + | |
32 | /* First, try to open using the device node path method */ | |
33 | ubi = ubi_open_volume_path(name, mode); | |
34 | if (!IS_ERR(ubi)) |