File CVE-2016-4454-qemuu-vmware-vga-vmsvga-out-of-bounds-read.patch of Package xen.7317

References: bsc#982224 CVE-2016-4454 

Sanity checks are applied when the fifo is enabled by the guest
(SVGA_REG_CONFIG_DONE write).  Which doesn't help much if the guest
changes the fifo registers afterwards.  Move the checks to
vmsvga_fifo_length so they are done each time qemu is about to read
from the fifo.

Fixes: CVE-2016-4454
Cc: P J P <address@hidden>
Reported-by: 李强 <address@hidden>
Signed-off-by: Gerd Hoffmann <address@hidden>
---
 hw/display/vmware_vga.c | 28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

Index: xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/vmware_vga.c
===================================================================
--- xen-4.4.4-testing.orig/tools/qemu-xen-dir-remote/hw/display/vmware_vga.c
+++ xen-4.4.4-testing/tools/qemu-xen-dir-remote/hw/display/vmware_vga.c
@@ -552,6 +552,21 @@ static inline int vmsvga_fifo_length(str
     if (!s->config || !s->enable) {
         return 0;
     }
+
+    /* Check range and alignment.  */
+    if ((CMD(min) | CMD(max) | CMD(next_cmd) | CMD(stop)) & 3) {
+        return 0;
+    }
+    if (CMD(min) < (uint8_t *) s->cmd->fifo - (uint8_t *) s->fifo) {
+        return 0;
+    }
+    if (CMD(max) > SVGA_FIFO_SIZE) {
+        return 0;
+    }
+    if (CMD(max) < CMD(min) + 10 * 1024) {
+        return 0;
+    }
+
     num = CMD(next_cmd) - CMD(stop);
     if (num < 0) {
         num += CMD(max) - CMD(min);
@@ -999,19 +1014,6 @@ static void vmsvga_value_write(void *opa
     case SVGA_REG_CONFIG_DONE:
         if (value) {
             s->fifo = (uint32_t *) s->fifo_ptr;
-            /* Check range and alignment.  */
-            if ((CMD(min) | CMD(max) | CMD(next_cmd) | CMD(stop)) & 3) {
-                break;
-            }
-            if (CMD(min) < (uint8_t *) s->cmd->fifo - (uint8_t *) s->fifo) {
-                break;
-            }
-            if (CMD(max) > SVGA_FIFO_SIZE) {
-                break;
-            }
-            if (CMD(max) < CMD(min) + 10 * 1024) {
-                break;
-            }
             vga_dirty_log_stop(&s->vga);
         }
         s->config = !!value;