File 0341-9pfs-break-out-virtio_init_iov_from.patch of Package qemu.6354

From 4b3f5481f7ee10d65899015ffa4fd9bf80a15baa Mon Sep 17 00:00:00 2001
From: Wei Liu <wei.liu2@citrix.com>
Date: Thu, 3 Dec 2015 13:21:51 +0000
Subject: [PATCH] 9pfs: break out virtio_init_iov_from_pdu

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 592707af7f9e7098949adae6ebf2b065456e0773)
[BR: Fix and/or infrastructure for BSC#1020427 CVE-2016-9602]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/9pfs/virtio-9p-device.c | 12 ++++++++++++
 hw/9pfs/virtio-9p.c        |  8 +-------
 hw/9pfs/virtio-9p.h        |  2 ++
 3 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/hw/9pfs/virtio-9p-device.c b/hw/9pfs/virtio-9p-device.c
index c2ada21957..7ad4e99b07 100644
--- a/hw/9pfs/virtio-9p-device.c
+++ b/hw/9pfs/virtio-9p-device.c
@@ -173,6 +173,18 @@ ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
                                offset, 1, fmt, ap);
 }
 
+void virtio_init_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
+                              unsigned int *pniov, bool is_write)
+{
+    if (is_write) {
+        *piov = pdu->elem.out_sg;
+        *pniov = pdu->elem.out_num;
+    } else {
+        *piov = pdu->elem.in_sg;
+        *pniov = pdu->elem.in_num;
+    }
+}
+
 /* virtio-9p device */
 
 static Property virtio_9p_properties[] = {
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index f35b9199f1..70f872fe8c 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -1696,13 +1696,7 @@ static void v9fs_init_qiov_from_pdu(QEMUIOVector *qiov, V9fsPDU *pdu,
     struct iovec *iov;
     unsigned int niov;
 
-    if (is_write) {
-        iov = pdu->elem.out_sg;
-        niov = pdu->elem.out_num;
-    } else {
-        iov = pdu->elem.in_sg;
-        niov = pdu->elem.in_num;
-    }
+    virtio_init_iov_from_pdu(pdu, &iov, &niov, is_write);
 
     qemu_iovec_init_external(&elem, iov, niov);
     qemu_iovec_init(qiov, niov);
diff --git a/hw/9pfs/virtio-9p.h b/hw/9pfs/virtio-9p.h
index e298949fde..5024ad0460 100644
--- a/hw/9pfs/virtio-9p.h
+++ b/hw/9pfs/virtio-9p.h
@@ -327,6 +327,8 @@ ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
                             const char *fmt, va_list ap);
 ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
                               const char *fmt, va_list ap);
+void virtio_init_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
+                              unsigned int *pniov, bool is_write);
 
 #define TYPE_VIRTIO_9P "virtio-9p-device"
 #define VIRTIO_9P(obj) \