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avcodec/pngdec: Check input space 

Fixes: Timeout (33sec -> 78ms)
Fixes: 14668/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LSCR_fuzzer-5767073352908800

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 2019-05-14 20:23:48 +02:00
parent 2b634e7c23
commit c830752142
1 changed files with 3 additions and 0 deletions
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libavcodec/pngdec.c
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@ -1535,6 +1535,9 @@ static int decode_frame_lscr(AVCodecContext *avctx,
AVFrame *frame = data;
int ret, nb_blocks, offset = 0;
if (avpkt->size < 2)
return AVERROR_INVALIDDATA;
bytestream2_init(gb, avpkt->data, avpkt->size);
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)