diff mbox

[29/56] vmsvga: don't process more than 1024 fifo commands at once

Message ID 1470690267-31454-30-git-send-email-mdroth@linux.vnet.ibm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Michael Roth Aug. 8, 2016, 9:04 p.m. UTC 
From: 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
(cherry picked from commit 4e68a0ee17dad7b8d870df0081d4ab2e079016c2)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/display/vmware_vga.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox

Patch

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;