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block/mirror: fix use after free of local_err 

local_err is used again in mirror_exit_common() after
bdrv_set_backing_hd(), so we must zero it. Otherwise try to set
non-NULL local_err will crash.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200324153630.11882-3-vsementsov@virtuozzo.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2020-03-24 18:36:26 +03:00 committed by Max Reitz
parent 01e38186ec
commit 66c8672d24
1 changed files with 1 additions and 0 deletions
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block/mirror.c
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@ -678,6 +678,7 @@ static int mirror_exit_common(Job *job)
bdrv_set_backing_hd(target_bs, backing, &local_err);
if (local_err) {
error_report_err(local_err);
local_err = NULL;
ret = -EPERM;
}
}