ubi: Fix out of bounds write in volume update code
authorRichard Weinberger <richard@nod.at>
Sun, 21 Feb 2016 09:53:03 +0000 (10:53 +0100)
committerRichard Weinberger <richard@nod.at>
Sat, 5 Mar 2016 20:56:23 +0000 (21:56 +0100)
ubi_start_leb_change() allocates too few bytes.
ubi_more_leb_change_data() will write up to req->upd_bytes +
ubi->min_io_size bytes.

Cc: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
drivers/mtd/ubi/upd.c

index 2a1b6e037e1a1ced496ac446ca07d6037ef61d0e..0134ba32a05784b65d1a0e6d470eee7a857df74c 100644 (file)
@@ -193,7 +193,7 @@ int ubi_start_leb_change(struct ubi_device *ubi, struct ubi_volume *vol,
        vol->changing_leb = 1;
        vol->ch_lnum = req->lnum;
 
-       vol->upd_buf = vmalloc(req->bytes);
+       vol->upd_buf = vmalloc(ALIGN((int)req->bytes, ubi->min_io_size));
        if (!vol->upd_buf)
                return -ENOMEM;