From: Max Reitz <mreitz@redhat.com>
Date: Thu, 7 Aug 2014 20:47:55 +0000 (+0200)
Subject: block: Catch !bs->drv in bdrv_check()
X-Git-Tag: TizenStudio_2.0_p2.3.2~208^2~656^2
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=908bcd540f489f7adf2d804347905b0025d808d3;p=sdk%2Femulator%2Fqemu.git

block: Catch !bs->drv in bdrv_check()

qemu-img check calls bdrv_check() twice if the first run repaired some
inconsistencies. If the first run however again triggered corruption
prevention (on qcow2) due to very bad inconsistencies, bs->drv may be
NULL afterwards. Thus, bdrv_check() should check whether bs->drv is set.

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

diff --git a/block.c b/block.c
index 6ef3465..6fa0201 100644
--- a/block.c
+++ b/block.c
@@ -2209,6 +2209,9 @@ bool bdrv_dev_is_medium_locked(BlockDriverState *bs)
  */
 int bdrv_check(BlockDriverState *bs, BdrvCheckResult *res, BdrvCheckMode fix)
 {
+    if (bs->drv == NULL) {
+        return -ENOMEDIUM;
+    }
     if (bs->drv->bdrv_check == NULL) {
         return -ENOTSUP;
     }