From c5e26182fedef98b73f50e9fac3ae09696e59880 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Wed, 26 Feb 2014 11:44:47 +0100
Subject: [PATCH 2/6] qxl: add sanity check

RH-Author: Gerd Hoffmann <kraxel@redhat.com>
Message-id: <1393415087-3776-2-git-send-email-kraxel@redhat.com>
Patchwork-id: 57815
O-Subject: [RHEL-7 qemu-kvm PATCH 1/1] qxl: add sanity check
Bugzilla: 751937
RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
(cherry picked from commit 9c70434f825fd0d2e89d1aa0f872159378d0aab3)
---
 hw/display/qxl.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 hw/display/qxl.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/hw/display/qxl.c b/hw/display/qxl.c
index 4381d97..4fe4f1b 100644
--- a/hw/display/qxl.c
+++ b/hw/display/qxl.c
@@ -1417,7 +1417,7 @@ static int qxl_destroy_primary(PCIQXLDevice *d, qxl_async_io async)
     return 1;
 }
 
-static void qxl_set_mode(PCIQXLDevice *d, int modenr, int loadvm)
+static void qxl_set_mode(PCIQXLDevice *d, unsigned int modenr, int loadvm)
 {
     pcibus_t start = d->pci.io_regions[QXL_RAM_RANGE_INDEX].addr;
     pcibus_t end   = d->pci.io_regions[QXL_RAM_RANGE_INDEX].size + start;
@@ -1427,6 +1427,12 @@ static void qxl_set_mode(PCIQXLDevice *d, int modenr, int loadvm)
         .mem_start = start,
         .mem_end = end
     };
+
+    if (modenr >= d->modes->n_modes) {
+        qxl_set_guest_bug(d, "mode number out of range");
+        return;
+    }
+
     QXLSurfaceCreate surface = {
         .width      = mode->x_res,
         .height     = mode->y_res,
-- 
1.7.1