File 0210-9pfs-fix-crash-when-fsdev-is-missin.patch of Package qemu.12301

From a477bb9b37e152f4412d8a3c92af9132add47d08 Mon Sep 17 00:00:00 2001
From: Greg Kurz <groug@kaod.org>
Date: Tue, 3 Jan 2017 17:28:44 +0100
Subject: [PATCH] 9pfs: fix crash when fsdev is missing

If the user passes -device virtio-9p without the corresponding -fsdev, QEMU
dereferences a NULL pointer and crashes.

This is a 2.8 regression introduced by commit 702dbcc274e2c.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
(cherry picked from commit f2b58c43758efc61e2a49b899f5e58848489d0dc)
[BR: Fix and/or infrastructure for BSC#1020427 CVE-2016-9602]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/9pfs/9p.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/9pfs/9p.c b/hw/9pfs/9p.c
index 15351ecfb0..4881d7d1a1 100644
--- a/hw/9pfs/9p.c
+++ b/hw/9pfs/9p.c
@@ -3361,7 +3361,7 @@ int v9fs_device_realize_common(V9fsState *s, Error **errp)
     rc = 0;
 out:
     if (rc) {
-        if (s->ops->cleanup && s->ctx.private) {
+        if (s->ops && s->ops->cleanup && s->ctx.private) {
             s->ops->cleanup(&s->ctx);
         }
         g_free(s->ctx.fs_root);