[PATCH] re_compile_pattern error handling

[Jakub Jelinek <jakub at redhat dot com>]

Hi!

I'm not sure if we are required to do this or not, but
if re_compile_pattern fails, it leaves the pattern buffer with cleared
buffer argument, but non-zero allocated, so if the application doesn't clear
allocated itself before calling re_compile_pattern on that pattern buffer
again, it segfaults.

2003-01-16  Jakub Jelinek  <jakub@redhat.com>

	* posix/regcomp.c (re_compile_internal): If clearing buffer, clear
	allocated too.  Reported by Al Viro <aviro@redhat.com>.

--- libc/posix/regcomp.c.jj	2002-12-20 13:42:50.000000000 +0100
+++ libc/posix/regcomp.c	2003-01-16 18:09:36.000000000 +0100
@@ -1,5 +1,5 @@
 /* Extended regular expression matching and search library.
-   Copyright (C) 2002 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Isamu Hasegawa <isamu@yamato.ibm.com>.
 
@@ -752,6 +752,7 @@ re_compile_internal (preg, pattern, leng
     {
       re_free (dfa);
       preg->buffer = NULL;
+      preg->allocated = 0;
       return err;
     }
 #ifdef DEBUG
@@ -765,6 +766,7 @@ re_compile_internal (preg, pattern, leng
     {
       re_free (dfa);
       preg->buffer = NULL;
+      preg->allocated = 0;
       return err;
     }
 
@@ -792,6 +794,7 @@ re_compile_internal (preg, pattern, leng
     re_compile_internal_free_return:
       free_dfa_content (dfa);
       preg->buffer = NULL;
+      preg->allocated = 0;
     }
 
   return err;

	Jakub