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| author | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-14 16:47:13 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2017-05-14 16:47:58 +0200 |
| commit | 467677769a2222ff8beab3c4d7826df9b7cbc81b (patch) | |
| tree | 650b26159e6ac9dfdc0b73924e53cb0af8ceb516 | |
| parent | c55e637072b694a1db40e21948d218bfa2e744bb (diff) | |
| download | ffmpeg-467677769a2222ff8beab3c4d7826df9b7cbc81b.tar.gz | |
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@niedermayer.cc>
| -rw-r--r-- | libavcodec/mpeg4videodec.c | 24 |
1 files 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) { |