File 0052-vmsvga-don-t-process-more-than-1024.patch of Package qemu

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File 0052-vmsvga-don-t-process-more-than-1024.patch of Package qemu (Revision ee24bd4e2cd7cd4604ab88bd7ddc29f1)

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From 51a212ea5bb9d958e0fd59d9e975685a8b9e62d0 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
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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 63a7c05..3bd4c52 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -596,13 +596,13 @@ 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;

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File 0052-vmsvga-don-t-process-more-than-1024.patch of Package qemu (Revision ee24bd4e2cd7cd4604ab88bd7ddc29f1)

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