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avcodec/hq_hqa: Check available space before reading slice offsets 

Fixes: Timeout (43sec -> 18sec)
Fixes: 14556/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HQ_HQA_fuzzer-5673543024508928

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-05-11 23:05:47 +02:00
parent e5ce105149
commit 407e7c34ca
1 changed files with 3 additions and 0 deletions
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3
libavcodec/hq_hqa.c
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@ -248,6 +248,9 @@ static int hqa_decode_frame(HQContext *ctx, AVFrame *pic, size_t data_size)
int width, height, quant;
const uint8_t *src = ctx->gbc.buffer;
if (bytestream2_get_bytes_left(&ctx->gbc) < 8 + 4*(num_slices + 1))
return AVERROR_INVALIDDATA;
width = bytestream2_get_be16(&ctx->gbc);
height = bytestream2_get_be16(&ctx->gbc);