From: Kevin Wolf <kwolf@redhat.com>
Date: Mon, 14 Apr 2014 12:47:14 +0000 (+0200)
Subject: block: Fix nb_sectors check in bdrv_check_byte_request()
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=54db38a47978381e23e7f6479c31a97b5d352f7e;p=qmiga%2Fqemu.git

block: Fix nb_sectors check in bdrv_check_byte_request()

nb_sectors is signed, check for negative values.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---

diff --git a/block.c b/block.c
index 990a7542a9..3b7951eb4f 100644
--- a/block.c
+++ b/block.c
@@ -2601,7 +2601,7 @@ static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset,
 static int bdrv_check_request(BlockDriverState *bs, int64_t sector_num,
                               int nb_sectors)
 {
-    if (nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
+    if (nb_sectors < 0 || nb_sectors > INT_MAX / BDRV_SECTOR_SIZE) {
         return -EIO;
     }