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Fix underflow

This commit is contained in:
Vurich 2017-07-03 16:49:06 +02:00
parent cc718bb108
commit 2e90e02a2c
1 changed files with 10 additions and 4 deletions
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14
ethcore/src/ethereum/ethash.rs
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@ -453,11 +453,14 @@ impl Ethash {
let parent_has_uncles = parent.uncles_hash() != &sha3::SHA3_EMPTY_LIST_RLP; let parent_has_uncles = parent.uncles_hash() != &sha3::SHA3_EMPTY_LIST_RLP;
let min_difficulty = self.ethash_params.minimum_difficulty; let min_difficulty = self.ethash_params.minimum_difficulty;
let difficulty_hardfork = header.number() >= self.ethash_params.difficulty_hardfork_transition; let difficulty_hardfork = header.number() >= self.ethash_params.difficulty_hardfork_transition;
let difficulty_bound_divisor = match difficulty_hardfork { let difficulty_bound_divisor = if difficulty_hardfork {
true => self.ethash_params.difficulty_hardfork_bound_divisor, self.ethash_params.difficulty_hardfork_bound_divisor
false => self.ethash_params.difficulty_bound_divisor, } else {
self.ethash_params.difficulty_bound_divisor
}; };
let duration_limit = self.ethash_params.duration_limit; let duration_limit = self.ethash_params.duration_limit;
let frontier_limit = self.ethash_params.homestead_transition; let frontier_limit = self.ethash_params.homestead_transition;
@ -483,7 +486,10 @@ impl Ethash {
if diff_inc <= threshold { if diff_inc <= threshold {
*parent.difficulty() + *parent.difficulty() / difficulty_bound_divisor * (threshold - diff_inc).into() *parent.difficulty() + *parent.difficulty() / difficulty_bound_divisor * (threshold - diff_inc).into()
} else { } else {
*parent.difficulty() - *parent.difficulty() / difficulty_bound_divisor * min(diff_inc - threshold, 99).into() let multiplier = min(diff_inc - threshold, 99).into();
parent.difficulty().saturating_sub(
*parent.difficulty() / difficulty_bound_divisor * multiplier
)
} }
}; };
target = max(min_difficulty, target); target = max(min_difficulty, target);