Re: [PATCH] avoid malloc(0) for AIX

[Eric Blake]

On 10/24/2011 12:11 PM, Fabian Groffen wrote:
> On AIX, malloc(0) segfaults, hence avoid calling malloc(0).
>
> --- sed-4.2.1/lib/regex_internal.c
> +++ sed-4.2.1/lib/regex_internal.c
> @@ -883,6 +883,9 @@
>        re_node_set *set;
>        int size;
>   {
> +  if ( size == 0 )
> +    return REG_NOERROR;
> +

Thanks for the patch.  However, this would be better discussed on the 
sed list (added in cc).  Furthermore, it would be better to fix this by 
using the gnulib 'malloc' module, which guarantees GNU behavior of a 
sane malloc(0) even on AIX, rather than auditing the sed source code for 
other possible instances of this problem.  That is, I think the better 
patch is:

diff --git i/autoboot.conf w/autoboot.conf
index 436bace..3cd3433 100644
--- i/autoboot.conf
+++ w/autoboot.conf
@@ -1,6 +1,6 @@
 # Bootstrap configuration.

-# Copyright (C) 2006-2008 Free Software Foundation, Inc.
+# Copyright (C) 2006-2008, 2011 Free Software Foundation, Inc.

 # This program is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -19,7 +19,8 @@
 # gnulib modules used by this package.
 gnulib_modules="
     acl alloca btowc c-ctype extensions fwriting getline getopt gettext-h
-    localcharset mbrlen mbrtowc mbsinit memchr mkostemp obstack pathmax 
regex
+    localcharset malloc mbrlen mbrtowc mbsinit memchr mkostemp obstack
+    pathmax regex
     rename selinux-h stdbool stat-macros ssize_t strerror strverscmp
     unlocked-io verify version-etc-fsf wcrtomb wctob"



--
Eric Blake   address@hidden    +1-801-349-2682
Libvirt virtualization library http://libvirt.org