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avcodec/scpr: Skip frames which change nothing 

Fixes: Timeout
Fixes: 10292/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SCPR_fuzzer-5687943864254464

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-09-25 02:36:35 +02:00
parent a8a98ba9ee
commit d702769213
1 changed files with 3 additions and 1 deletions
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4
libavcodec/scpr.c
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@ -516,7 +516,7 @@ static int decompress_p(AVCodecContext *avctx,
int backstep = linesize - avctx->width;
if (bytestream2_get_byte(gb) == 0)
return 0;
return 1;
bytestream2_skip(gb, 1);
init_rangecoder(&s->rc, gb);
@ -813,6 +813,8 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
s->current_frame->linesize[0] / 4,
(uint32_t *)s->last_frame->data[0],
s->last_frame->linesize[0] / 4);
if (ret == 1)
return avpkt->size;
} else {
return AVERROR_PATCHWELCOME;
}