[FFmpeg-devel] [PATCH 4/7] avcodec/g729dec: Avoid using buf_size

[Michael Niedermayer]

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 at niedermayer.cc>
---
 libavcodec/g729dec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/g729dec.c b/libavcodec/g729dec.c
index 300fac1c04..4d70cb6eba 100644
--- a/libavcodec/g729dec.c
+++ b/libavcodec/g729dec.c
@@ -454,11 +454,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
             buf++;
         }
 
-        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);
-- 
2.23.0