[FFmpeg-cvslog] r8919 - trunk/libavcodec/h263.c

[michael]

Author: michael
Date: Sun May  6 17:25:04 2007
New Revision: 8919

Log:
fix possibly exploitable stack overflow with num_sprite_warping_points (found by reimar)


Modified:
   trunk/libavcodec/h263.c

Modified: trunk/libavcodec/h263.c
==============================================================================
--- trunk/libavcodec/h263.c	(original)
+++ trunk/libavcodec/h263.c	Sun May  6 17:25:04 2007
@@ -5665,6 +5665,11 @@ static int decode_vol_header(MpegEncCont
                 skip_bits1(gb); /* marker */
             }
             s->num_sprite_warping_points= get_bits(gb, 6);
+            if(s->num_sprite_warping_points > 3){
+                av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
+                s->num_sprite_warping_points= 0;
+                return -1;
+            }
             s->sprite_warping_accuracy = get_bits(gb, 2);
             s->sprite_brightness_change= get_bits1(gb);
             if(s->vol_sprite_usage==STATIC_SPRITE)