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fix integer overflow in subnormal_power10 (#355) 

detected by oss-fuzz

https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=18714
This commit is contained in:
Paul Dreik 2019-11-04 22:54:03 +01:00 committed by Daniel Lemire
parent c97eb41dc6
commit cf493254b7
1 changed files with 7 additions and 1 deletions
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8
src/numberparsing.h
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@ -185,7 +185,13 @@ static inline uint32_t parse_eight_digits_unrolled(const char *chars) {
// //
// This function computes base * 10 ^ (- negative_exponent ). // This function computes base * 10 ^ (- negative_exponent ).
// It is only even going to be used when negative_exponent is tiny. // It is only even going to be used when negative_exponent is tiny.
static double subnormal_power10(double base, int negative_exponent) { static double subnormal_power10(double base, int64_t negative_exponent) {
// avoid integer overflows in the pow expression, those values would
// become zero anyway.
if(negative_exponent < -1000) {
return 0;
}
// this is probably not going to be fast // this is probably not going to be fast
return base * 1e-308 * pow(10, negative_exponent + 308); return base * 1e-308 * pow(10, negative_exponent + 308);
} }