File 0126-vmsvga-more-cursor-checks.patch of Package qemu-linux-user.4226

Overview Repositories Revisions Requests Users Attributes Meta

File 0126-vmsvga-more-cursor-checks.patch of Package qemu-linux-user.4226

From f7ddbb4f2775b40f7060a642f6ca2807c06a1e18 Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Tue, 29 Sep 2015 09:58:05 +0200
Subject: [PATCH] vmsvga: more cursor checks

Check the cursor size more carefully.  Also switch to unsigned while
being at it, so they can't be negative.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 5829b097204189c56dd1fb62c7f827360394bb39)
[BR: support patch for CVE-2016-7170 BSC#998516]
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/display/vmware_vga.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/hw/display/vmware_vga.c b/hw/display/vmware_vga.c
index cdd1036efd..13840f2d08 100644
--- a/hw/display/vmware_vga.c
+++ b/hw/display/vmware_vga.c
@@ -488,10 +488,10 @@ static inline int vmsvga_fill_rect(struct vmsvga_state_s *s,
 #endif
 
 struct vmsvga_cursor_definition_s {
-    int width;
-    int height;
+    uint32_t width;
+    uint32_t height;
     int id;
-    int bpp;
+    uint32_t bpp;
     int hot_x;
     int hot_y;
     uint32_t mask[1024];
@@ -673,7 +673,10 @@ static void vmsvga_fifo_run(struct vmsvga_state_s *s)
             cursor.bpp = vmsvga_fifo_read(s);
 
             args = SVGA_BITMAP_SIZE(x, y) + SVGA_PIXMAP_SIZE(x, y, cursor.bpp);
-            if (SVGA_BITMAP_SIZE(x, y) > sizeof cursor.mask ||
+            if (cursor.width > 256 ||
+                cursor.height > 256 ||
+                cursor.bpp > 32 ||
+                SVGA_BITMAP_SIZE(x, y) > sizeof cursor.mask ||
                 SVGA_PIXMAP_SIZE(x, y, cursor.bpp) > sizeof cursor.image) {
                     goto badcmd;
             }

Places

File 0126-vmsvga-more-cursor-checks.patch of Package qemu-linux-user.4226

Places