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: v4.14.76~5 X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=4c925efc22301608ffef444dc45cc07adc931bd3;p=users%2Fjedix%2Flinux-maple.git 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index e1cd3dcf5a031..ad827cf642fe5 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))