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avcodec/bonk: Avoid undefined integer overflow in predictor_calc_error() 

Fixes: signed integer overflow: -159584 * 5105950 cannot be represented in type 'int'
Fixes: 55165/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BONK_fuzzer-5796023719297024

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 2023-02-18 21:50:13 +01:00
parent a76efafdb9
commit 43e5e2e423
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1 changed files with 2 additions and 2 deletions
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libavcodec/bonk.c
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@ -270,14 +270,14 @@ static inline int shift(int a, int b)
static int predictor_calc_error(int *k, int *state, int order, int error)
{
int i, x = error - shift_down(k[order-1] * state[order-1], LATTICE_SHIFT);
int i, x = error - shift_down(k[order-1] * (unsigned)state[order-1], LATTICE_SHIFT);
int *k_ptr = &(k[order-2]),
*state_ptr = &(state[order-2]);
for (i = order-2; i >= 0; i--, k_ptr--, state_ptr--) {
unsigned k_value = *k_ptr, state_value = *state_ptr;
x -= shift_down(k_value * state_value, LATTICE_SHIFT);
x -= shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
state_ptr[1] = state_value + shift_down(k_value * x, LATTICE_SHIFT);
}