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fix potential too many open files for xtables.lock #127

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fix potential too many open files for xtables.lock #127

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10 changes: 7 additions & 3 deletions iptables/lock.go
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Original file line number Diff line number Diff line change
Expand Up @@ -35,9 +35,13 @@ type Unlocker interface {
Unlock() error
}

type nopUnlocker struct{}
type nopUnlocker struct {
fd int
}

func (_ nopUnlocker) Unlock() error { return nil }
func (n *nopUnlocker) Unlock() error {
return syscall.Close(n.fd)
}

type fileLock struct {
// mu is used to protect against concurrent invocations from within this process
Expand All @@ -57,7 +61,7 @@ func (l *fileLock) tryLock() (Unlocker, error) {
switch err {
case syscall.EWOULDBLOCK:
l.mu.Unlock()
return nopUnlocker{}, nil
return &nopUnlocker{l.fd}, nil
case nil:
return l, nil
default:
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