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)

---

 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 84be1c8..be2095a 100644

--- a/hw/9pfs/9p.c

+++ b/hw/9pfs/9p.c

@@ -3481,7 +3481,7 @@ 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->tag);