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avcodec/bonk: Fix undefined overflow in predictor_calc_error()

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Fixes: signed integer overflow: -2146469728 - 1488954 cannot be represented in type 'int'
Fixes: 62490/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BONK_fuzzer-5612782399389696

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 2023-10-05 14:17:05 +02:00
parent ef3b42738b
commit cd66606a8f
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1 changed files with 1 additions and 1 deletions
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libavcodec/bonk.c
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@ -270,7 +270,7 @@ static inline int shift(int a, int b)
static int predictor_calc_error(int *k, int *state, int order, int error) static int predictor_calc_error(int *k, int *state, int order, int error)
{ {
int i, x = error - shift_down(k[order-1] * (unsigned)state[order-1], LATTICE_SHIFT); int i, x = error - (unsigned)shift_down(k[order-1] * (unsigned)state[order-1], LATTICE_SHIFT);
int *k_ptr = &(k[order-2]), int *k_ptr = &(k[order-2]),
*state_ptr = &(state[order-2]); *state_ptr = &(state[order-2]);