UBI: fix nameless volumes handling

commit 4a59c797a18917a5cf3ff7ade296b46134d91e6a upstream.

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.

Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 111ea41c4ecd7aa956be1f21c26d775dc68270e4..1d11e86a1c90cbe22be7ee6f82b08d3c51ef331f 100644 (file)
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -628,6 +628,9 @@ 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;