diff mbox

[PATCHv3,15/20] block/get_block_status: avoid segfault if there is no backing_hd

Message ID 1380029714-5239-16-git-send-email-pl@kamp.de
State New
Headers show

Commit Message

Peter Lieven Sept. 24, 2013, 1:35 p.m. UTC 
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Peter Lieven <pl@kamp.de>
---
 block.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox

Patch

diff --git a/block.c b/block.c
index 3499c90..3bf1163 100644
--- a/block.c
+++ b/block.c
@@ -3266,7 +3266,7 @@  static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs,
     if (!(ret & BDRV_BLOCK_DATA)) {
         if (bdrv_has_zero_init(bs)) {
             ret |= BDRV_BLOCK_ZERO;
-        } else {
+        } else if (bs->backing_hd) {
             BlockDriverState *bs2 = bs->backing_hd;
             int64_t length2 = bdrv_getlength(bs2);
             if (length2 >= 0 && sector_num >= (length2 >> BDRV_SECTOR_BITS)) {