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[Qemu-devel] [PULL 50/54] block/mirror: check backing in bdrv_mirror_top


From: Kevin Wolf
Subject: [Qemu-devel] [PULL 50/54] block/mirror: check backing in bdrv_mirror_top_refresh_filename
Date: Fri, 6 Oct 2017 17:54:18 +0200

From: Vladimir Sementsov-Ogievskiy <address@hidden>

Backing may be zero after failed bdrv_attach_child in
bdrv_set_backing_hd, which leads to SIGSEGV.

Signed-off-by: Vladimir Sementsov-Ogievskiy <address@hidden>
Message-id: address@hidden
Reviewed-by: John Snow <address@hidden>
Signed-off-by: Max Reitz <address@hidden>
---
 block/mirror.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/mirror.c b/block/mirror.c
index 459b80f8f3..3b6f0c5772 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1058,6 +1058,11 @@ static int coroutine_fn 
bdrv_mirror_top_pdiscard(BlockDriverState *bs,
 
 static void bdrv_mirror_top_refresh_filename(BlockDriverState *bs, QDict *opts)
 {
+    if (bs->backing == NULL) {
+        /* we can be here after failed bdrv_attach_child in
+         * bdrv_set_backing_hd */
+        return;
+    }
     bdrv_refresh_filename(bs->backing->bs);
     pstrcpy(bs->exact_filename, sizeof(bs->exact_filename),
             bs->backing->bs->filename);
-- 
2.13.6




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