[Qemu-devel] [PATCH 1.1 03/22] block: do not reuse the backing file across bdrv_close/bdrv_open

[Paolo Bonzini]

This is another bug caused by not doing a full cleanup of the BDS
across close/open.  This was found with mirroring by Shaolong Hu,
but it can probably be reproduced also with eject or change.

Signed-off-by: Paolo Bonzini <address@hidden>
---
 block.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/block.c b/block.c
index 6dc0d44..271f109 100644
--- a/block.c
+++ b/block.c
@@ -878,6 +878,8 @@ void bdrv_close(BlockDriverState *bs)
         bs->opaque = NULL;
         bs->drv = NULL;
         bs->copy_on_read = 0;
+        bs->backing_file[0] = '\0';
+        bs->backing_format[0] = '\0';
 
         if (bs->file != NULL) {
             bdrv_close(bs->file);
-- 
1.7.10.1