[Qemu-devel] [PATCH 022/108] usb: sanity check setup_index+setup_len in post_load

[Michael Roth]

From: "Michael S. Tsirkin" <address@hidden>

CVE-2013-4541

s->setup_len and s->setup_index are fed into usb_packet_copy as
size/offset into s->data_buf, it's possible for invalid state to exploit
this to load arbitrary data.

setup_len and setup_index should be checked to make sure
they are not negative.

Cc: Gerd Hoffmann <address@hidden>
Signed-off-by: Michael S. Tsirkin <address@hidden>
Reviewed-by: Gerd Hoffmann <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
(cherry picked from commit 9f8e9895c504149d7048e9fc5eb5cbb34b16e49a)
Signed-off-by: Michael Roth <address@hidden>
---
 hw/usb/bus.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/usb/bus.c b/hw/usb/bus.c
index fe70429..e48b19f 100644
--- a/hw/usb/bus.c
+++ b/hw/usb/bus.c
@@ -49,7 +49,9 @@ static int usb_device_post_load(void *opaque, int version_id)
     } else {
         dev->attached = 1;
     }
-    if (dev->setup_index >= sizeof(dev->data_buf) ||
+    if (dev->setup_index < 0 ||
+        dev->setup_len < 0 ||
+        dev->setup_index >= sizeof(dev->data_buf) ||
         dev->setup_len >= sizeof(dev->data_buf)) {
         return -EINVAL;
     }
-- 
1.9.1