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avcodec/g729dec: Avoid using buf_size

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buf_size is not updated as buf is advanced so it is wrong after the first
iteration

Fixes: Timeout (160sec -> 27sec)
Fixes: 18658/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G729_fuzzer-5729784269373440

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 336f9461df)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-11-09 21:21:51 +01:00
parent 3292f6c6be
commit fe04b47cea
1 changed files with 2 additions and 2 deletions
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4
libavcodec/g729dec.c
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@ -452,11 +452,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
int is_periodic = 0; ///< whether one of the subframes is declared as periodic or not
out_frame = (int16_t*)frame->data[c];
for (i = 0; i < buf_size; i++)
for (i = 0; i < format->block_size; i++)
frame_erasure |= buf[i];
frame_erasure = !frame_erasure;
init_get_bits(&gb, buf, 8*buf_size);
init_get_bits(&gb, buf, 8*format->block_size);
ma_predictor = get_bits(&gb, 1);
quantizer_1st = get_bits(&gb, VQ_1ST_BITS);