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avcodec/wmaprodec: Fix buflen computation in save_bits() 

Fixes: Assertion failure
Fixes: 18630/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMAPRO_fuzzer-5201588654440448

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 2019-11-08 19:20:31 +01:00
parent 0e010e489b
commit 589cb44498
1 changed files with 3 additions and 3 deletions
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6
libavcodec/wmaprodec.c
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@ -1565,9 +1565,9 @@ static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len,
s->frame_offset = get_bits_count(gb) & 7;
s->num_saved_bits = s->frame_offset;
init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE);
}
buflen = (put_bits_count(&s->pb) + len + 8) >> 3;
buflen = (s->num_saved_bits + len + 7) >> 3;
} else
buflen = (put_bits_count(&s->pb) + len + 7) >> 3;
if (len <= 0 || buflen > MAX_FRAMESIZE) {
avpriv_request_sample(s->avctx, "Too small input buffer");