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lnwallet: in NewChannelReservation ensure commit fees are payable 

In this commit, we fix a bug introduced by the recent change of
lnwire.MilliSatoshi to be an unsigned integer. After this change an
integer underflow was left undetected, as a result we’ll now
momentarily cast to a signed integer in order to ensure that both sides
can pay the proper fee.
This commit is contained in:
Olaoluwa Osuntokun 2018-02-24 19:11:14 -08:00
parent 5ecef17e0f
commit 8425a35684
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GPG Key ID: 964EA263DD637C21
1 changed files with 18 additions and 0 deletions
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18
lnwallet/reservation.go
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@ -157,6 +157,15 @@ func NewChannelReservation(capacity, fundingAmt btcutil.Amount,
ourBalance = pushMSat
theirBalance = capacityMSat - feeMSat - pushMSat
initiator = false
// If the responder doesn't have enough funds to actually pay
// the fees, then we'll bail our early.
if int64(theirBalance) < 0 {
return nil, ErrFunderBalanceDust(
int64(commitFee), int64(theirBalance.ToSatoshis()),
int64(2*DefaultDustLimit()),
)
}
} else {
// TODO(roasbeef): need to rework fee structure in general and
// also when we "unlock" dual funder within the daemon
@ -177,6 +186,15 @@ func NewChannelReservation(capacity, fundingAmt btcutil.Amount,
}
initiator = true
// If we, the initiator don't have enough funds to actually pay
// the fees, then we'll exit with an error.
if int64(ourBalance) < 0 {
return nil, ErrFunderBalanceDust(
int64(commitFee), int64(ourBalance),
int64(2*DefaultDustLimit()),
)
}
}
// If we're the initiator and our starting balance within the channel