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avcodec/ptx: Check that the input contains at least one line 

Fixes: Timeout (19sec -> 44ms)
Fixes: 17816/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PTX_fuzzer-5704459950227456

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit a6ad328256)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-10-02 22:05:52 +02:00
parent f75c931238
commit d3d4ba2dbe
1 changed files with 3 additions and 0 deletions
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libavcodec/ptx.c
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@ -55,6 +55,9 @@ static int ptx_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
buf += offset;
if (buf_end - buf < w * bytes_per_pixel)
return AVERROR_INVALIDDATA;
if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
return ret;