From 37f31b6ca4311b94d985fb398a72e5399ad57925 Mon Sep 17 00:00:00 2001
From: Richard Weinberger <richard@nod.at>
Date: Mon, 3 Sep 2018 23:06:23 +0200
Subject: [PATCH] ubifs: Check for name being NULL while mounting
Git-commit: 37f31b6ca4311b94d985fb398a72e5399ad57925
Patch-mainline: v4.19-rc5
References: bsc#1051510
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
fs/ubifs/super.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 23e7042666a7..87d08f738632 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -1954,6 +1954,9 @@ 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))
--
2.18.0