UBI: fix nameless volumes handling

Currently it's possible to create a volume without a name. E.g:
ubimkvol -n 32 -s 2MiB -t static /dev/ubi0 -N ""

After that vtbl_check() will always fail because it does not permit
empty strings.

Cc: stable@kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 3320a50ba4f0..ad76592fb2f4 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -632,6 +632,9 @@ static int verify_mkvol_req(const struct ubi_device *ubi,
         if (req->alignment != 1 && n)
                 goto bad;
 
+        if (!req->name[0] || !req->name_len)
+                goto bad;
+
         if (req->name_len > UBI_VOL_NAME_MAX) {
                 err = -ENAMETOOLONG;
                 goto bad;