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block: do not reuse the backing file across bdrv_close/bdrv_open 

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 <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-05-08 16:51:43 +02:00 committed by Kevin Wolf
parent 3a389e7926
commit a275fa42fa
1 changed files with 2 additions and 0 deletions
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2
block.c
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@ -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);