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block: mirror - use local_err to avoid NULL errp 

When starting a block job, commit_active_start() relies on whether *errp
is set by mirror_start_job.  This allows it to determine if the mirror
job start failed, so that it can clean up any changes to open flags from
the bdrv_reopen().  If errp is NULL, then it will not be able to
determine if mirror_start_job failed or not.

To avoid this, use a local Error variable, and then propagate the error
(if any) to errp.

Reported-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Jeff Cody 2014-02-13 09:23:38 -05:00 committed by Stefan Hajnoczi
parent 2aa4a86f59
commit cc67f4d1f9
1 changed files with 4 additions and 2 deletions
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6
block/mirror.c
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@ -634,6 +634,7 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
int64_t length, base_length;
int orig_base_flags;
int ret;
Error *local_err = NULL;
orig_base_flags = bdrv_get_flags(base);
@ -668,9 +669,10 @@ void commit_active_start(BlockDriverState *bs, BlockDriverState *base,
bdrv_ref(base);
mirror_start_job(bs, base, speed, 0, 0,
on_error, on_error, cb, opaque, errp,
on_error, on_error, cb, opaque, &local_err,
&commit_active_job_driver, false, base);
if (error_is_set(errp)) {
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
goto error_restore_flags;
}