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Remove stake split overflow opportunities #13649

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CriesofCarrots merged 1 commit into from
Nov 17, 2020
Merged

Remove stake split overflow opportunities #13649

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4 changes: 2 additions & 2 deletions programs/stake/src/stake_state.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -910,7 +910,7 @@ impl<'a> StakeAccount for KeyedAccount<'a> {
// verify full withdrawal can cover rent in new split account
|| (lamports < split_rent_exempt_reserve && lamports == self.lamports()?)
// verify enough lamports left in previous stake and not full withdrawal
|| (lamports > self.lamports()? - meta.rent_exempt_reserve
|| (lamports + meta.rent_exempt_reserve > self.lamports()?
&& lamports != self.lamports()?)
{
return Err(InstructionError::InsufficientFunds);
Expand All @@ -929,7 +929,7 @@ impl<'a> StakeAccount for KeyedAccount<'a> {
// account, this prevents any magic activation of stake by prefunding the
// split account.
(
lamports - meta.rent_exempt_reserve,
lamports.saturating_sub(meta.rent_exempt_reserve),
lamports - split_rent_exempt_reserve,
)
} else {
Expand Down