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avcodec/celp_filters: Avoid invalid negation in ff_celp_lp_synthesis_filter()

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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>
This commit is contained in:
Michael Niedermayer 2020-09-23 23:31:59 +02:00
parent 4f54f53003
commit 11a6347f9e
1 changed files with 3 additions and 3 deletions
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6
libavcodec/celp_filters.c
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@ -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)