qemu: Security fix for CVE-2019-12155

Source: qemu.org
MR: 98382
Type: Security Fix
Disposition: Backport from https://git.qemu.org/?p=qemu.git;a=commit;h=d52680fc932efb8a2f334cc6993e705ed1e31e99
ChangeID: e4e5983ec1fa489eb8a0db08d1afa0606e59dde3
Description:

Fixes CVE-2019-12155
Affects: <= 4.0.0
(From OE-Core rev: 6045c57895cad301c5e3a94de740427343a08065)

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

meta/recipes-devtools/qemu/qemu/CVE-2019-12155.patch

@@ -0,0 +1,38 @@
+From d52680fc932efb8a2f334cc6993e705ed1e31e99 Mon Sep 17 00:00:00 2001
+From: Prasad J Pandit <pjp@fedoraproject.org>
+Date: Thu, 25 Apr 2019 12:05:34 +0530
+Subject: [PATCH] qxl: check release info object
+
+When releasing spice resources in release_resource() routine,
+if release info object 'ext.info' is null, it leads to null
+pointer dereference. Add check to avoid it.
+
+Reported-by: Bugs SysSec <bugs-syssec@rub.de>
+Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
+Message-id: 20190425063534.32747-1-ppandit@redhat.com
+Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
+
+Upstream-Status: Backport
+https://git.qemu.org/?p=qemu.git;a=commit;h=d52680fc932efb8a2f334cc6993e705ed1e31e99
+
+CVE: CVE-2019-12155
+Affects: <= 4.0.0
+Signed-off-by: Armin Kuster <akuster@mvistra.com>
+---
+ hw/display/qxl.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+Index: qemu-3.0.0/hw/display/qxl.c
+===================================================================
+--- qemu-3.0.0.orig/hw/display/qxl.c
++++ qemu-3.0.0/hw/display/qxl.c
+@@ -764,6 +764,9 @@ static void interface_release_resource(Q
+     QXLReleaseRing *ring;
+     uint64_t *item, id;
+ 
++    if (!ext.info) {
++        return;
++    }
+     if (ext.group_id == MEMSLOT_GROUP_HOST) {
+         /* host group -> vga mode update request */
+         QXLCommandExt *cmdext = (void *)(intptr_t)(ext.info->id);

meta/recipes-devtools/qemu/qemu_3.0.0.bb

@@ -31,6 +31,7 @@ SRC_URI = "https://download.qemu.org/${BPN}-${PV}.tar.xz \
            file://CVE-2018-19364_p1.patch \
            file://CVE-2018-19364_p2.patch \
            file://CVE-2018-19489.patch \
+           file://CVE-2019-12155.patch \
            "
 UPSTREAM_CHECK_REGEX = "qemu-(?P<pver>\d+(\.\d+)+)\.tar"