diff -urN musl.orig/include/stdlib.h musl/include/stdlib.h
--- musl.orig/include/stdlib.h	Thu May  8 09:04:08 2014
+++ musl/include/stdlib.h	Thu May  8 09:11:06 2014
@@ -44,6 +44,9 @@
 void *realloc (void *, size_t);
 void free (void *);
 void *aligned_alloc(size_t alignment, size_t size);
+#ifdef _BSD_SOURCE
+void *reallocarray(void *, size_t, size_t);
+#endif
 
 _Noreturn void abort (void);
 int atexit (void (*) (void));
diff -urN musl.orig/src/stdlib/reallocarray.c musl/src/stdlib/reallocarray.c
--- musl.orig/src/stdlib/reallocarray.c	Thu Jan  1 00:00:00 1970
+++ musl/src/stdlib/reallocarray.c	Thu May  8 09:06:30 2014
@@ -0,0 +1,17 @@
+#include <stdlib.h>
+#include <limits.h>
+#include <errno.h>
+
+/* this is sqrt(SIZE_MAX+1), as s1*s2 <= SIZE_MAX
+ * if both s1 < MUL_NO_OVERFLOW and s2 < MUL_NO_OVERFLOW */
+#define MUL_NO_OVERFLOW	(1UL << (sizeof(size_t) * 4))
+
+void *reallocarray(void *optr, size_t nmemb, size_t size)
+{
+	if ((nmemb >= MUL_NO_OVERFLOW || size >= MUL_NO_OVERFLOW) &&
+	    nmemb > 0 && SSIZE_MAX / nmemb < size) {
+		errno = ENOMEM;
+		return NULL;
+	}
+	return realloc(optr, size * nmemb);
+}