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avcodec/g729postfilter: Limit shift in long term filter

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Fixes: shift exponent 34 is too large for 32-bit type 'int'
Fixes: 57389/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ACELP_KELVIN_fuzzer-6229522659016704

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 6d1d8609ac)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer committed 2023-12-21 22:43:35 +01:00
1 parent d5fa6e3a91
commit 548d1b8dc1
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libavcodec/g729postfilter.c
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@@ -350,7 +350,7 @@ static int16_t long_term_filter(AudioDSPContext *adsp, int pitch_delay_int,
if (tmp > 0)
L_temp0 >>= tmp;
else
L_temp1 >>= -tmp;
L_temp1 >>= FFMIN(-tmp, 31);
/* Check if longer filter increases the values of R'(k). */
if (L_temp1 > L_temp0) {