File 0268-vmsvga-don-t-process-more-than-1024.patch of Package qemu-linux-user.7445

Overview Repositories Revisions Requests Users Attributes Meta

File 0268-vmsvga-don-t-process-more-than-1024.patch of Package qemu-linux-user.7445

From e496693967d7fd892f1bc2444b26591c2dd3aad7 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Mon, 30 May 2016 09:09:21 +0200
Subject: [PATCH] vmsvga: don't process more than 1024 fifo commands at once
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

vmsvga_fifo_run is called in regular intervals (on each display update)
and will resume where it left off.  So we can simply exit the loop,
without having to worry about how processing will continue.

Fixes: CVE-2016-4453
Cc: qemu-stable@nongnu.org
Cc: P J P <ppandit@redhat.com>
Reported-by: 李强 <liqiang6-s@360.cn>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1464592161-18348-5-git-send-email-kraxel@redhat.com
(cherry picked from commit 4e68a0ee17dad7b8d870df0081d4ab2e079016c2)
[BR: CVE-2016-4453 BSC#982223]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/display/vmware_vga.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
index 7696cb4b41..4b955f5124 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -594,13 +594,13 @@ static inline uint32_t vmsvga_fifo_read(struct vmsvga_state_s *s)
 static void vmsvga_fifo_run(struct vmsvga_state_s *s)
 {
     uint32_t cmd, colour;
-    int args, len;
+    int args, len, maxloop = 1024;
     int x, y, dx, dy, width, height;
     struct vmsvga_cursor_definition_s cursor;
     uint32_t cmd_start;
 
     len = vmsvga_fifo_length(s);
-    while (len > 0) {
+    while (len > 0 && --maxloop > 0) {
         /* May need to go back to the start of the command if incomplete */
         cmd_start = s->cmd->stop;

Places

File 0268-vmsvga-don-t-process-more-than-1024.patch of Package qemu-linux-user.7445

Places