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Source:
http://lists.gnu.org/archive/html/bug-gnu-utils/2005-08/msg00112.html

Bug Report: sed-4.1.4 misinterprets uClibc's malloc (patch included)
From: 	Yuri Vasilevski
Subject: 	Bug Report: sed-4.1.4 misinterprets uClibc's malloc (patch included)
Date: 	Tue, 23 Aug 2005 23:17:40 -0500

Hi,

Recent versions of sed expect glibc behavior form malloc, i.e.
malloc(0) return live pointer. This is not true for uClibc (and many
other old/classical libc implementations).

So I made and attach a patch to solve this problem. It basically makes
re_node_set_alloc(set,0) behave exactly as re_node_set_init_empty(set).

Yuri.

diff -Naur sed-4.1.4.orig/lib/regex_internal.c sed-4.1.4/lib/regex_internal.c
--- sed-4.1.4.orig/lib/regex_internal.c	2005-01-28 09:07:56 +0000
+++ sed-4.1.4/lib/regex_internal.c	2005-08-24 03:20:28 +0000
@@ -885,8 +885,9 @@
 {
   set->alloc = size;
   set->nelem = 0;
-  set->elems = re_malloc (int, size);
-  if (BE (set->elems == NULL, 0))
+  set->elems = re_malloc (int, size); /* can be NULL if size == 0
+				(see re_node_set_init_empty(set)) */
+  if (BE (set->elems == NULL && size != 0, 0))
     return REG_ESPACE;
   return REG_NOERROR;
 }