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commit: Replace commit_top_bs on failure after deleting the block job 

If there's an error in commit_start() then the block job must be
deleted before replacing commit_top_bs, otherwise it will fail because
of lack of permissions. This happens since the permission system was
introduced in 8dfba27977.

Fortunately this bug doesn't seem to be possible to reproduce at the
moment without changing the code.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Alberto Garcia 2019-02-15 15:49:32 +02:00 committed by Kevin Wolf
parent 57830a499f
commit 2468eed3be
1 changed files with 3 additions and 1 deletions
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4
block/commit.c
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@ -374,10 +374,12 @@ fail:
if (s->top) {
blk_unref(s->top);
}
job_early_fail(&s->common.job);
/* commit_top_bs has to be replaced after deleting the block job,
* otherwise this would fail because of lack of permissions. */
if (commit_top_bs) {
bdrv_replace_node(commit_top_bs, top, &error_abort);
}
job_early_fail(&s->common.job);
}