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avcodec/sonic: Fix integer overflow in predictor_calc_error()

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Fixes: signed integer overflow: 5 * -1094995529 cannot be represented in type 'int'
Fixes: 18346/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SONIC_fuzzer-5709623893426176

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 2019-10-21 23:41:49 +02:00
parent faea5b4462
commit c8c17b8cef
1 changed files with 1 additions and 1 deletions
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libavcodec/sonic.c
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@ -473,7 +473,7 @@ static int predictor_calc_error(int *k, int *state, int order, int error)
{ {
int k_value = *k_ptr, state_value = *state_ptr; int k_value = *k_ptr, state_value = *state_ptr;
x -= shift_down(k_value * state_value, LATTICE_SHIFT); x -= shift_down(k_value * state_value, LATTICE_SHIFT);
state_ptr[1] = state_value + shift_down(k_value * x, LATTICE_SHIFT); state_ptr[1] = state_value + shift_down(k_value * (unsigned)x, LATTICE_SHIFT);
} }
#else #else
for (i = order-2; i >= 0; i--) for (i = order-2; i >= 0; i--)