[Qemu-devel] [PATCHv2 15/20] block/get_block_status: avoid segfault if there is no backing_hd

[Peter Lieven]

Reviewed-by: Eric Blake <address@hidden>
Signed-off-by: Peter Lieven <address@hidden>
---
 block.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block.c b/block.c
index 805ee26..461a1d7 100644
--- a/block.c
+++ b/block.c
@@ -3195,7 +3195,7 @@ 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)) {
-- 
1.7.9.5