From 96f2197494791f5884c01b5caa908074cc7e90a6 Mon Sep 17 00:00:00 2001
From: Rich Felker <dalias@aerifal.cx>
Date: Sun, 20 Feb 2011 15:16:04 -0500
Subject: [PATCH] fix null pointer dereference introduced in last sigprocmask
 commit

---
 src/signal/sigprocmask.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/signal/sigprocmask.c b/src/signal/sigprocmask.c
index db27f12a..1bc5baa6 100644
--- a/src/signal/sigprocmask.c
+++ b/src/signal/sigprocmask.c
@@ -12,7 +12,7 @@ int __sigprocmask(int how, const sigset_t *set, sigset_t *old)
 {
 	sigset_t tmp;
 	/* Disallow blocking thread control signals */
-	if (how != SIG_UNBLOCK) {
+	if (set && how != SIG_UNBLOCK) {
 		tmp = *set;
 		set = &tmp;
 		sigdelset(&tmp, SIGCANCEL);