[FFmpeg-cvslog] avcodec/mpeg4videodec: Clear sprite wraping on unsupported cases in VOP decode

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun May 14 16:47:13 2017 +0200| [467677769a2222ff8beab3c4d7826df9b7cbc81b] | committer: Michael Niedermayer

avcodec/mpeg4videodec: Clear sprite wraping on unsupported cases in VOP decode

Fixes: Integer overflow
Fixes: 1572/clusterfuzz-testcase-minimized-4578773729017856

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=467677769a2222ff8beab3c4d7826df9b7cbc81b
---

 libavcodec/mpeg4videodec.c | 24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index 39f177f8d0..54b7be10dd 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -2455,16 +2455,20 @@ static int decode_vop_header(Mpeg4DecContext *ctx, GetBitContext *gb)
         ff_init_scantable(s->idsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
     }
 
-    if (s->pict_type == AV_PICTURE_TYPE_S &&
-        (ctx->vol_sprite_usage == STATIC_SPRITE ||
-         ctx->vol_sprite_usage == GMC_SPRITE)) {
-        if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
-            return AVERROR_INVALIDDATA;
-        if (ctx->sprite_brightness_change)
-            av_log(s->avctx, AV_LOG_ERROR,
-                   "sprite_brightness_change not supported\n");
-        if (ctx->vol_sprite_usage == STATIC_SPRITE)
-            av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
+    if (s->pict_type == AV_PICTURE_TYPE_S) {
+        if((ctx->vol_sprite_usage == STATIC_SPRITE ||
+            ctx->vol_sprite_usage == GMC_SPRITE)) {
+            if (mpeg4_decode_sprite_trajectory(ctx, gb) < 0)
+                return AVERROR_INVALIDDATA;
+            if (ctx->sprite_brightness_change)
+                av_log(s->avctx, AV_LOG_ERROR,
+                    "sprite_brightness_change not supported\n");
+            if (ctx->vol_sprite_usage == STATIC_SPRITE)
+                av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
+        } else {
+            memset(s->sprite_offset, 0, sizeof(s->sprite_offset));
+            memset(s->sprite_delta, 0, sizeof(s->sprite_delta));
+        }
     }
 
     if (ctx->shape != BIN_ONLY_SHAPE) {