File 0340-9pfs-factor-out-pdu_push_and_notify.patch of Package qemu.8405

From c12fd621552860a627281ece8ad6d9148539fe98 Mon Sep 17 00:00:00 2001
From: Wei Liu <wei.liu2@citrix.com>
Date: Wed, 2 Dec 2015 14:43:40 +0000
Subject: [PATCH] 9pfs: factor out pdu_push_and_notify

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
(cherry picked from commit f657b17a6394e68f985111d3db33b299deb0cc3e)
[BR: Fix and/or infrastructure for BSC#1020427 CVE-2016-9602]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/9pfs/virtio-9p.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index df090dc98b..f35b9199f1 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -61,6 +61,17 @@ ssize_t pdu_unmarshal(V9fsPDU *pdu, size_t offset, const char *fmt, ...)
     return ret;
 }
 
+static void pdu_push_and_notify(V9fsPDU *pdu)
+{
+    V9fsState *s = pdu->s;
+
+    /* push onto queue and notify */
+    virtqueue_push(s->vq, &pdu->elem, pdu->size);
+
+    /* FIXME: we should batch these completions */
+    virtio_notify(VIRTIO_DEVICE(s), s->vq);
+}
+
 static int omode_to_uflags(int8_t mode)
 {
     int ret = 0;
@@ -653,11 +664,7 @@ static void pdu_complete(V9fsPDU *pdu, ssize_t len)
     pdu->size = len;
     pdu->id = id;
 
-    /* push onto queue and notify */
-    virtqueue_push(s->vq, &pdu->elem, len);
-
-    /* FIXME: we should batch these completions */
-    virtio_notify(VIRTIO_DEVICE(s), s->vq);
+    pdu_push_and_notify(pdu);
 
     /* Now wakeup anybody waiting in flush for this request */
     qemu_co_queue_next(&pdu->complete);