Index: uspace/lib/c/generic/tls.c
===================================================================
--- uspace/lib/c/generic/tls.c	(revision 63f89665fc0283c1661274dc636d5a66e03d48b4)
+++ uspace/lib/c/generic/tls.c	(revision 22dfd380be327d91cff2394cd2f3d9143dd73a90)
@@ -42,4 +42,5 @@
 #include <str.h>
 #include <align.h>
+#include <unistd.h>
 
 /** Create TLS (Thread Local Storage) data structures.
@@ -57,4 +58,6 @@
 	
 	tcb = __alloc_tls(&data, tls_size);
+	if (!tcb)
+		return NULL;
 	
 	/*
@@ -89,5 +92,8 @@
 
 	result = malloc(sizeof(tcb_t) + size);
+	if (!result)
+		return NULL;
 	*data = ((void *)result) + sizeof(tcb_t);
+
 	return result;
 }
@@ -118,5 +124,6 @@
 	size = ALIGN_UP(size, &_tls_alignment);
 	*data = memalign((uintptr_t) &_tls_alignment, sizeof(tcb_t) + size);
-
+	if (!*data)
+		return NULL;
 	tcb = (tcb_t *) (*data + size);
 	tcb->self = tcb;