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avcodec/bonk: Fix integer overflow in predictor_calc_error()

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Fixes: signed integer overflow: -2147483300 - 12285 cannot be represented in type 'int'
Fixes: 59462/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_BONK_fuzzer-5714298807386112

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2b25a5168e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-06-03 02:00:51 +02:00
parent ebc4d0a310
commit 38bc713c6d
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1 changed files with 1 additions and 1 deletions
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libavcodec/bonk.c
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@ -277,7 +277,7 @@ static int predictor_calc_error(int *k, int *state, int order, int error)
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 * (unsigned)state_value, LATTICE_SHIFT);
x -= (unsigned) shift_down(k_value * (unsigned)state_value, LATTICE_SHIFT);
state_ptr[1] = state_value + shift_down(k_value * x, LATTICE_SHIFT);
}