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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Mon, 30 May 2016 09:09:21 +0200
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Subject: [PATCH] vmsvga: don't process more than 1024 fifo commands at once
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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vmsvga_fifo_run is called in regular intervals (on each display update)
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and will resume where it left off. So we can simply exit the loop,
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without having to worry about how processing will continue.
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Fixes: CVE-2016-4453
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Cc: qemu-stable@nongnu.org
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Cc: P J P <ppandit@redhat.com>
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Reported-by: 李强 <liqiang6-s@360.cn>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: 1464592161-18348-5-git-send-email-kraxel@redhat.com
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(cherry picked from commit 4e68a0ee17dad7b8d870df0081d4ab2e079016c2)
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---
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hw/display/vmware_vga.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
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index de2567b..e51a05e 100644
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--- a/hw/display/vmware_vga.c
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+++ b/hw/display/vmware_vga.c
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@@ -597,13 +597,13 @@ static inline uint32_t vmsvga_fifo_read(struct vmsvga_state_s *s)
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static void vmsvga_fifo_run(struct vmsvga_state_s *s)
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{
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uint32_t cmd, colour;
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- int args, len;
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+ int args, len, maxloop = 1024;
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int x, y, dx, dy, width, height;
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struct vmsvga_cursor_definition_s cursor;
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uint32_t cmd_start;
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len = vmsvga_fifo_length(s);
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- while (len > 0) {
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+ while (len > 0 && --maxloop > 0) {
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/* May need to go back to the start of the command if incomplete */
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cmd_start = s->fifo_stop;
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