X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;ds=sidebyside;f=src%2Fthread%2Fpthread_sigmask.c;h=f188782a3277ed6dbcadb1cb8b8af90dc73efbdd;hb=21a172dd36cae7a08492fd3a7500d7bf0daee13e;hp=88c333f6b682b0c3db71fc35b5e7ed69636272a4;hpb=571744447c23f91feb6439948f3a619aca850dfb;p=musl

diff --git a/src/thread/pthread_sigmask.c b/src/thread/pthread_sigmask.c
index 88c333f6..f188782a 100644
--- a/src/thread/pthread_sigmask.c
+++ b/src/thread/pthread_sigmask.c
@@ -5,7 +5,7 @@
 int pthread_sigmask(int how, const sigset_t *restrict set, sigset_t *restrict old)
 {
 	int ret;
-	if ((unsigned)how - SIG_BLOCK > 2U) return EINVAL;
+	if (set && (unsigned)how - SIG_BLOCK > 2U) return EINVAL;
 	ret = -__syscall(SYS_rt_sigprocmask, how, set, old, _NSIG/8);
 	if (!ret && old) {
 		if (sizeof old->__bits[0] == 8) {