qemu: Security fix CVE-2016-4439

affects qemu < 2.6.0

(From OE-Core rev: b5c787631cd35fa5b3f10391c883ae7a3717690f)

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

meta/recipes-devtools/qemu/qemu/CVE-2016-4439.patch

@@ -0,0 +1,46 @@
+From 0a5e3685ea10c578f8063ca0dbb009af45693d85 Mon Sep 17 00:00:00 2001
+From: Prasad J Pandit <pjp@fedoraproject.org>
+Date: Thu, 19 May 2016 16:09:30 +0530
+Subject: [PATCH] esp: check command buffer length before write(CVE-2016-4439)
+
+The 53C9X Fast SCSI Controller(FSC) comes with an internal 16-byte
+FIFO buffer. It is used to handle command and data transfer. While
+writing to this command buffer 's->cmdbuf[TI_BUFSZ=16]', a check
+was missing to validate input length. Add check to avoid OOB write
+access.
+
+Fixes CVE-2016-4439.
+
+Reported-by: Li Qiang <liqiang6-s@360.cn>
+Cc: qemu-stable@nongnu.org
+Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
+Message-Id: <1463654371-11169-2-git-send-email-ppandit@redhat.com>
+Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
+(cherry picked from commit c98c6c105f66f05aa0b7c1d2a4a3f716450907ef)
+Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
+
+Upstream-Status: Backport
+CVE: CVE-2016-4439
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ hw/scsi/esp.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+Index: qemu-2.4.0/hw/scsi/esp.c
+===================================================================
+--- qemu-2.4.0.orig/hw/scsi/esp.c
++++ qemu-2.4.0/hw/scsi/esp.c
+@@ -446,7 +446,11 @@ void esp_reg_write(ESPState *s, uint32_t
+         break;
+     case ESP_FIFO:
+         if (s->do_cmd) {
+-            s->cmdbuf[s->cmdlen++] = val & 0xff;
++            if (s->cmdlen < TI_BUFSZ) {
++                s->cmdbuf[s->cmdlen++] = val & 0xff;
++            } else {
++                trace_esp_error_fifo_overrun();
++            }
+         } else if (s->ti_size == TI_BUFSZ - 1) {
+             trace_esp_error_fifo_overrun();
+         } else {

meta/recipes-devtools/qemu/qemu_2.5.0.bb

@@ -21,6 +21,7 @@ SRC_URI += "file://configure-fix-Darwin-target-detection.patch \
             file://CVE-2016-3712_p2.patch \
             file://CVE-2016-3712_p3.patch \
             file://CVE-2016-3712_p4.patch \
+            file://CVE-2016-4439.patch \
            "
 SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.bz2"
 SRC_URI[md5sum] = "f469f2330bbe76e3e39db10e9ac4f8db"