1 files changed, 52 insertions, 0 deletions

diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2015-7295_3.patch b/meta/recipes-devtools/qemu/qemu/CVE-2015-7295_3.patch
new file mode 100644
index 0000000000..74442e32f5
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/CVE-2015-7295_3.patch
@@ -0,0 +1,52 @@
+From 0cf33fb6b49a19de32859e2cdc6021334f448fb3 Mon Sep 17 00:00:00 2001
+From: Jason Wang <jasowang@redhat.com>
+Date: Fri, 25 Sep 2015 13:21:30 +0800
+Subject: [PATCH] virtio-net: correctly drop truncated packets
+
+When packet is truncated during receiving, we drop the packets but
+neither discard the descriptor nor add and signal used
+descriptor. This will lead several issues:
+
+- sg mappings are leaked
+- rx will be stalled if a lots of packets were truncated
+
+In order to be consistent with vhost, fix by discarding the descriptor
+in this case.
+
+Cc: Michael S. Tsirkin <mst@redhat.com>
+Signed-off-by: Jason Wang <jasowang@redhat.com>
+Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
+Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
+
+Upstream-Status: Backport
+
+git.qemu.org/?p=qemu.git;a=commit;h=0cf33fb6b49a19de32859e2cdc6021334f448fb3
+
+CVE: CVE-2015-7295 patch #3
+[Yocto # 9013]
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ hw/net/virtio-net.c | 8 +-------
+ 1 file changed, 1 insertion(+), 7 deletions(-)
+
+Index: qemu-2.4.0/hw/net/virtio-net.c
+===================================================================
+--- qemu-2.4.0.orig/hw/net/virtio-net.c
++++ qemu-2.4.0/hw/net/virtio-net.c
+@@ -1086,13 +1086,7 @@ static ssize_t virtio_net_receive(NetCli
+          * must have consumed the complete packet.
+          * Otherwise, drop it. */
+         if (!n->mergeable_rx_bufs && offset < size) {
+-#if 0
+-            error_report("virtio-net truncated non-mergeable packet: "
+-                         "i %zd mergeable %d offset %zd, size %zd, "
+-                         "guest hdr len %zd, host hdr len %zd",
+-                         i, n->mergeable_rx_bufs,
+-                         offset, size, n->guest_hdr_len, n->host_hdr_len);
+-#endif
++            virtqueue_discard(q->rx_vq, &elem, total);
+             return size;
+         }
+