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Blame SOURCES/kvm-block-allow-bdrv_unref-to-be-passed-NULL-pointers.patch

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From 9a9800bbe9e2a38adaccc98314fff2354a52037e Mon Sep 17 00:00:00 2001
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From: Jeffrey Cody <jcody@redhat.com>
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Date: Tue, 16 Sep 2014 20:11:50 +0200
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Subject: [PATCH 12/20] block: allow bdrv_unref() to be passed NULL pointers
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Message-id: <aadda07926a2fbf063041cd73b68b8846ff677ed.1410897407.git.jcody@redhat.com>
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Patchwork-id: 61216
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O-Subject: [PATCH qemu-kvm-rhel RHEL7.1 11/15] block: allow bdrv_unref() to be passed NULL pointers
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Bugzilla: 1098086
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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If bdrv_unref() is passed a NULL BDS pointer, it is safe to
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exit with no operation.  This will allow cleanup code to blindly
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call bdrv_unref() on a BDS that has been initialized to NULL.
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Reviewed-by: Max Reitz <mreitz@redhat.com>
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 9a4d5ca60772e09d0cbac01f1b4778aa68e00eaa)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 block.c |    3 +++
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 1 files changed, 3 insertions(+), 0 deletions(-)
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diff --git a/block.c b/block.c
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index a2e95f6..af162fe 100644
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--- a/block.c
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+++ b/block.c
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@@ -5083,6 +5083,9 @@ void bdrv_ref(BlockDriverState *bs)
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  * deleted. */
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 void bdrv_unref(BlockDriverState *bs)
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 {
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+    if (!bs) {
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+        return;
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+    }
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     assert(bs->refcnt > 0);
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     if (--bs->refcnt == 0) {
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         bdrv_delete(bs);
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-- 
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1.7.1
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