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[Qemu-devel] [PATCH v2] block: mirror - use local_err to avoid NULL errp


From: Jeff Cody
Subject: [Qemu-devel] [PATCH v2] block: mirror - use local_err to avoid NULL errp
Date: Thu, 13 Feb 2014 09:23:38 -0500

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 <address@hidden>
Signed-off-by: Jeff Cody <address@hidden>
---
 block/mirror.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/block/mirror.c b/block/mirror.c
index 2a43334..ddb5765 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -633,6 +633,8 @@ void commit_active_start(BlockDriverState *bs, 
BlockDriverState *base,
 {
     int64_t length, base_length;
     int orig_base_flags;
+    Error *local_err = NULL;
+
 
     orig_base_flags = bdrv_get_flags(base);
 
@@ -663,9 +665,10 @@ 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;
     }
 
-- 
1.8.3.1




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