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avcodec/wcmv: Avoid copying frames if they are unchanged 

Improves speed of the testcase by about a factor of 10

Fixes: Timeout
Fixes: 13132/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WCMV_fuzzer-5664190616829952

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-02-19 19:05:10 +01:00
parent 286a33e429
commit 976dae8b32
1 changed files with 3 additions and 1 deletions
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4
libavcodec/wcmv.c
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@ -56,11 +56,13 @@ static int decode_frame(AVCodecContext *avctx,
}
bytestream2_init(&gb, avpkt->data, avpkt->size);
blocks = bytestream2_get_le16(&gb);
if (!blocks)
return avpkt->size;
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
blocks = bytestream2_get_le16(&gb);
if (blocks > 5) {
GetByteContext bgb;
int x = 0, size;