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avcodec/jpeg2000dec: clear pointer which become stale in get_ppt() 

Fixes: use after free
Fixes: 22484/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JPEG2000_fuzzer-5671488765296640

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Gautam Ramakrishnan <gautamramk@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-05-31 12:49:50 +02:00
parent 01fd93e2ac
commit 4b2248594c
1 changed files with 1 additions and 0 deletions
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libavcodec/jpeg2000dec.c
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@ -928,6 +928,7 @@ static int get_ppt(Jpeg2000DecoderContext *s, int n)
tile->packed_headers = new;
} else
return AVERROR(ENOMEM);
memset(&tile->packed_headers_stream, 0, sizeof(tile->packed_headers_stream));
memcpy(tile->packed_headers + tile->packed_headers_size,
s->g.buffer, n - 3);
tile->packed_headers_size += n - 3;