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qcow2: Fix memory leak in COW error path 

This triggers if bs->drv becomes NULL in a concurrent request. This is
currently only the case when corruption prevention kicks in (i.e. at
most once per image, and after that it produces I/O errors).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2014-05-19 17:56:01 +02:00 committed by Stefan Hajnoczi
parent 4ba6fabfb4
commit bd60436936
1 changed files with 2 additions and 1 deletions
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3
block/qcow2-cluster.c
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@ -379,7 +379,8 @@ static int coroutine_fn copy_sectors(BlockDriverState *bs,
BLKDBG_EVENT(bs->file, BLKDBG_COW_READ); BLKDBG_EVENT(bs->file, BLKDBG_COW_READ);
if (!bs->drv) { if (!bs->drv) {
return -ENOMEDIUM; ret = -ENOMEDIUM;
goto out;
} }
/* Call .bdrv_co_readv() directly instead of using the public block-layer /* Call .bdrv_co_readv() directly instead of using the public block-layer