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avcodec/mxpegdec: fix SOF counting 

Fixes: Timeout (>10sec -> 15ms)
Fixes: 27652/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MXPEG_fuzzer-5125920868007936

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 2020-12-03 00:31:07 +01:00
parent a5ed6da9bd
commit 401495def6
1 changed files with 2 additions and 1 deletions
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3
libavcodec/mxpegdec.c
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@ -245,16 +245,17 @@ static int mxpeg_decode_frame(AVCodecContext *avctx,
"Multiple SOF in a frame\n");
return AVERROR_INVALIDDATA;
}
s->got_sof_data = 0;
ret = ff_mjpeg_decode_sof(jpg);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR,
"SOF data decode error\n");
s->got_sof_data = 0;
return ret;
}
if (jpg->interlaced) {
av_log(avctx, AV_LOG_ERROR,
"Interlaced mode not supported in MxPEG\n");
s->got_sof_data = 0;
return AVERROR(EINVAL);
}
s->got_sof_data ++;