qemu: Security fix CVE-2015-7512

CVE-2015-7512 Qemu: net: pcnet: buffer overflow in non-loopback mod

(From OE-Core rev: e6e9be51f77c9531f49cebe0ca6b495c23cf022d)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/qemu/CVE-2015-7512.patch

@@ -0,0 +1,44 @@
+From 8b98a2f07175d46c3f7217639bd5e03f2ec56343 Mon Sep 17 00:00:00 2001
+From: Jason Wang <jasowang@redhat.com>
+Date: Mon, 30 Nov 2015 15:00:06 +0800
+Subject: [PATCH] pcnet: fix rx buffer overflow(CVE-2015-7512)
+
+Backends could provide a packet whose length is greater than buffer
+size. Check for this and truncate the packet to avoid rx buffer
+overflow in this case.
+
+Cc: Prasad J Pandit <pjp@fedoraproject.org>
+Cc: qemu-stable@nongnu.org
+Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
+Signed-off-by: Jason Wang <jasowang@redhat.com>
+
+Upsteam_Status: Backport
+
+http://git.qemu.org/?p=qemu.git;a=commit;h=8b98a2f07175d46c3f7217639bd5e03f2ec56343
+
+CVE: CVE-2015-7512
+[Yocto # 9013]
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ hw/net/pcnet.c | 6 ++++++
+ 1 file changed, 6 insertions(+)
+
+Index: qemu-2.4.0/hw/net/pcnet.c
+===================================================================
+--- qemu-2.4.0.orig/hw/net/pcnet.c
++++ qemu-2.4.0/hw/net/pcnet.c
+@@ -1065,6 +1065,12 @@ ssize_t pcnet_receive(NetClientState *nc
+             int pktcount = 0;
+ 
+             if (!s->looptest) {
++                if (size > 4092) {
++#ifdef PCNET_DEBUG_RMD
++                    fprintf(stderr, "pcnet: truncates rx packet.\n");
++#endif
++                    size = 4092;
++                }
+                 memcpy(src, buf, size);
+                 /* no need to compute the CRC */
+                 src[size] = 0;

meta/recipes-devtools/qemu/qemu_2.4.0.bb

@@ -12,6 +12,7 @@ SRC_URI += "file://configure-fix-Darwin-target-detection.patch \
             file://no-valgrind.patch \
             file://CVE-2015-8504.patch \
             file://CVE-2015-7504.patch \
+            file://CVE-2015-7512.patch \
            "
 SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.bz2"
 SRC_URI[md5sum] = "186ee8194140a484a455f8e3c74589f4"