if (sig < 1 || sig > _NSIG) 
if (!valid_signal(sig) || sig < 1) 
int disallow_signal(int sig){	if (sig < 1 || sig > _NSIG)		return -EINVAL;	spin_lock_irq(&current->sighand->siglock);	sigaddset(&current->blocked, sig);	recalc_sigpending();	spin_unlock_irq(&current->sighand->siglock);	return 0;}
4520	/local/tlutelli/issta_data/temp/c/2005_temp/2005/4520/7ed20e1ad521b5f5df61bf6559ae60738e393741/exit.c/buggy/kernel/exit.c