[Qemu-devel] [PULL 5/6] vmsvga: don't process more than 1024 fifo commands at once

[Gerd Hoffmann <kraxel@redhat.com>]

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
---
 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 de2567b..e51a05e 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -597,13 +597,13 @@ 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->fifo_stop;
 
-- 
1.8.3.1