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avutil/lfg: Correct index increment type to avoid undefined behavior
Fixes: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int' Fixes: 18333/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_COMFORTNOISE_fuzzer-5668481831272448 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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@ -51,8 +51,9 @@ int av_lfg_init_from_data(AVLFG *c, const uint8_t *data, unsigned int length);
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* it may be good enough and faster for your specific use case.
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*/
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static inline unsigned int av_lfg_get(AVLFG *c){
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c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
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return c->state[c->index++ & 63];
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unsigned a = c->state[c->index & 63] = c->state[(c->index-24) & 63] + c->state[(c->index-55) & 63];
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c->index += 1U;
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return a;
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}
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/**
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@ -63,7 +64,9 @@ static inline unsigned int av_lfg_get(AVLFG *c){
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static inline unsigned int av_mlfg_get(AVLFG *c){
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unsigned int a= c->state[(c->index-55) & 63];
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unsigned int b= c->state[(c->index-24) & 63];
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return c->state[c->index++ & 63] = 2*a*b+a+b;
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a = c->state[c->index & 63] = 2*a*b+a+b;
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c->index += 1U;
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return a;
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}
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/**
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