Index: uspace/lib/c/generic/malloc.c
===================================================================
--- uspace/lib/c/generic/malloc.c	(revision da287d16f76967ca44d7813d30c7a1a046348e1a)
+++ uspace/lib/c/generic/malloc.c	(revision 4fc93d5494fe531c5527e5641a67447f42cf2587)
@@ -720,4 +720,10 @@
 		return NULL;
 	
+	/*
+	 * The size of the allocated block needs to be naturally
+	 * aligned, because the footer structure also needs to reside
+	 * on a naturally aligned address in order to avoid unaligned
+	 * memory accesses.
+	 */
 	size_t gross_size = GROSS_SIZE(ALIGN_UP(size, BASE_ALIGN));
 	
@@ -760,4 +766,6 @@
 void *calloc(const size_t nmemb, const size_t size)
 {
+	// FIXME: Check for overflow
+	
 	void *block = malloc(nmemb * size);
 	if (block == NULL)
@@ -899,5 +907,5 @@
 	if (addr == NULL)
 		return;
-
+	
 	futex_down(&malloc_futex);