Check for invalid update parameters in vmd video decoder.
authorLaurent Aimar <fenrir@videolan.org>
Sat, 24 Sep 2011 21:16:18 +0000 (23:16 +0200)
committerMichael Niedermayer <michaelni@gmx.at>
Sat, 1 Oct 2011 18:24:39 +0000 (20:24 +0200)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit e7aed1280ea14b60fceae04d71dfd03e1daf2d04)

libavcodec/vmdav.c

index ebc8c7e..d7cd3bb 100644 (file)
@@ -204,6 +204,16 @@ static void vmd_decode(VmdVideoContext *s)
     frame_y = AV_RL16(&s->buf[8]);
     frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
     frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
+    if (frame_x < 0 || frame_width < 0 ||
+        frame_x >= s->avctx->width ||
+        frame_width > s->avctx->width ||
+        frame_x + frame_width > s->avctx->width)
+        return;
+    if (frame_y < 0 || frame_height < 0 ||
+        frame_y >= s->avctx->height ||
+        frame_height > s->avctx->height ||
+        frame_y + frame_height > s->avctx->height)
+        return;
 
     if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
         (frame_x || frame_y)) {