From 56a21c3a967a6cbf99e2ecb2dff30d4dca759532 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Thu, 20 Jun 2019 13:07:31 +0100 Subject: [PATCH 1/2] qxl: check release info object MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Philippe Mathieu-Daudé Message-id: <20190620130731.18034-2-philmd@redhat.com> Patchwork-id: 88745 O-Subject: [RHEL-8.1.0 qemu-kvm PATCH 1/1] qxl: check release info object Bugzilla: 1712705 RH-Acked-by: Laszlo Ersek RH-Acked-by: Gerd Hoffmann RH-Acked-by: Stefan Hajnoczi From: Prasad J Pandit 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 Signed-off-by: Prasad J Pandit Message-id: 20190425063534.32747-1-ppandit@redhat.com Signed-off-by: Gerd Hoffmann (cherry picked from commit d52680fc932efb8a2f334cc6993e705ed1e31e99) Signed-off-by: Danilo C. L. de Paula --- hw/display/qxl.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/display/qxl.c b/hw/display/qxl.c index b373c50..a8c953b 100644 --- a/hw/display/qxl.c +++ b/hw/display/qxl.c @@ -776,6 +776,9 @@ static void interface_release_resource(QXLInstance *sin, 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); -- 1.8.3.1