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avcodec/agm: Check for reference frame earlier 

Fixes: Timeout (14sec -  120ms)
Fixes: 17824/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_AGM_fuzzer-5639825457152000

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 2019-10-04 00:46:08 +02:00
parent a6ad328256
commit 315a445933
1 changed files with 7 additions and 4 deletions
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11
libavcodec/agm.c
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@ -1117,6 +1117,13 @@ static int decode_frame(AVCodecContext *avctx, void *data,
frame->key_frame = s->key_frame;
frame->pict_type = s->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
if (!s->key_frame) {
if (!s->prev_frame->data[0]) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
return AVERROR_INVALIDDATA;
}
}
if (header) {
if (avctx->codec_tag == MKTAG('A', 'G', 'M', '0') ||
avctx->codec_tag == MKTAG('A', 'G', 'M', '1'))
@ -1186,10 +1193,6 @@ static int decode_frame(AVCodecContext *avctx, void *data,
else
ret = decode_intra(avctx, gb, frame);
} else {
if (!s->prev_frame->data[0]) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
return AVERROR_INVALIDDATA;
}
if (s->prev_frame-> width != frame->width ||
s->prev_frame->height != frame->height)
return AVERROR_INVALIDDATA;