From: Richard Weinberger Date: Mon, 3 Sep 2018 21:06:23 +0000 (+0200) Subject: ubifs: Check for name being NULL while mounting X-Git-Tag: v4.19-rc5~9^2~2 X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=37f31b6ca4311b94d985fb398a72e5399ad57925;p=uclinux-h8%2Flinux.git ubifs: Check for name being NULL while mounting 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 --- 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))