avcodec/g729postfilter: Limit shift in long term filter

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>
2 years ago · 6d1d8609ac
parent c2ed905b68
commit 6d1d8609ac
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/g729postfilter.c
+++ b/libavcodec/g729postfilter.c
@ -353,7 +353,7 @@ 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) {