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avcodec/bonk: Use unsigned in predictor_init_state() to avoid undefined behavior

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Fixes: signed integer overflow: -5010 * -717450 cannot be represented in type 'int'
Fixes: 53370/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BONK_fuzzer-4945644204195840

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2022-11-16 14:11:51 +01:00
parent 88f0e05c72
commit 8f975641d7
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1 changed files with 2 additions and 2 deletions
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libavcodec/bonk.c
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@ -280,10 +280,10 @@ static int predictor_calc_error(int *k, int *state, int order, int error)
return x;
}
static void predictor_init_state(int *k, int *state, int order)
static void predictor_init_state(int *k, unsigned *state, int order)
{
for (int i = order - 2; i >= 0; i--) {
int x = state[i];
unsigned x = state[i];
for (int j = 0, p = i + 1; p < order; j++, p++) {
int tmp = x + shift_down(k[j] * state[p], LATTICE_SHIFT);