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| author | Michael Niedermayer <michael@niedermayer.cc> | 2020-09-23 23:31:59 +0200 |
|---|---|---|
| committer | Michael Niedermayer <michael@niedermayer.cc> | 2020-10-10 13:08:24 +0200 |
| commit | 11a6347f9e544a1b9fba059ae02c30c0e512c195 (patch) | |
| tree | 3bd9995a4c54a40207e9d6a3e1aaf19b9bce698a /libavcodec/celp_filters.c | |
| parent | 4f54f530039db149808478796e8389c14eb73095 (diff) | |
| download | ffmpeg-11a6347f9e544a1b9fba059ae02c30c0e512c195.tar.gz | |
avcodec/celp_filters: Avoid invalid negation in ff_celp_lp_synthesis_filter()
Fixes: negation of -2147483648 cannot be represented in type 'int'; cast to an unsigned type to negate this value to itself
Fixes: 25675/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G729_fuzzer-4786580731199488
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Diffstat (limited to 'libavcodec/celp_filters.c')
| -rw-r--r-- | libavcodec/celp_filters.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/libavcodec/celp_filters.c b/libavcodec/celp_filters.c index fafedd99a3..40ff7427df 100644 --- a/libavcodec/celp_filters.c +++ b/libavcodec/celp_filters.c @@ -65,11 +65,11 @@ int ff_celp_lp_synthesis_filter(int16_t *out, const int16_t *filter_coeffs, int i,n; for (n = 0; n < buffer_length; n++) { - int sum = -rounder, sum1; + int sum = rounder, sum1; for (i = 1; i <= filter_length; i++) - sum += (unsigned)(filter_coeffs[i-1] * out[n-i]); + sum -= (unsigned)(filter_coeffs[i-1] * out[n-i]); - sum1 = ((-sum >> 12) + in[n]) >> shift; + sum1 = ((sum >> 12) + in[n]) >> shift; sum = av_clip_int16(sum1); if (stop_on_overflow && sum != sum1) |