[BZ #5058]

2007-09-24  Ulrich Drepper  <drepper@redhat.com>
	[BZ #5058]
	* intl/gettextP.h (struct loaded_domain): Add conversions_lock member.
	* intl/loadmsgcat.c (_nl_load_domain): Initialize conversions_lock.
	(_nl_unload_domain): Finalize conversions_lock.
	* intl/dcigettext.c (_nl_find_msg): Take conversions_lock before
	handling table of known conversions.

	* posix/regcomp.c (lookup_collation_sequence_value): Check that

2 files changed, 34 insertions, 5 deletions

diff --git a/intl/dcigettext.c b/intl/dcigettext.c
index ad2835f930..55dcaabd80 100644
--- a/intl/dcigettext.c
+++ b/intl/dcigettext.c
@@ -850,6 +850,9 @@ _nl_find_msg (domain_file, domainbinding, msgid, convert, lengthp)
       /* We are supposed to do a conversion.  */
       const char *encoding = get_output_charset (domainbinding);
 
+      /* Protect against reallocation of the table.  */
+      __libc_rwlock_rdlock (domain->conversions_lock);
+
       /* Search whether a table with converted translations for this
 	 encoding has already been allocated.  */
       size_t nconversions = domain->nconversions;
@@ -866,8 +869,25 @@ _nl_find_msg (domain_file, domainbinding, msgid, convert, lengthp)
 	    }
 	}
 
+      __libc_rwlock_unlock (domain->conversions_lock);
+
       if (convd == NULL)
 	{
+	  /* We have to allocate a new conversions table.  */
+	  __libc_rwlock_wrlock (domain->conversions_lock);
+
+	  /* Maybe in the meantime somebody added the translation.
+	     Recheck.  */
+	  for (i = nconversions; i > 0; )
+	    {
+	      i--;
+	      if (strcmp (domain->conversions[i].encoding, encoding) == 0)
+		{
+		  convd = &domain->conversions[i];
+		  goto found_convd;
+		}
+	    }
+
 	  /* Allocate a table for the converted translations for this
 	     encoding.  */
 	  struct converted_domain *new_conversions =
@@ -876,9 +896,13 @@ _nl_find_msg (domain_file, domainbinding, msgid, convert, lengthp)
 		     (nconversions + 1) * sizeof (struct converted_domain));
 
 	  if (__builtin_expect (new_conversions == NULL, 0))
-	    /* Nothing we can do, no more memory.  We cannot use the
-	       translation because it might be encoded incorrectly.  */
-	    return (char *) -1;
+	    {
+	      /* Nothing we can do, no more memory.  We cannot use the
+		 translation because it might be encoded incorrectly.  */
+	    unlock_fail:
+	      __libc_rwlock_unlock (domain->conversions_lock);
+	      return (char *) -1;
+	    }
 
 	  domain->conversions = new_conversions;
 
@@ -887,7 +911,7 @@ _nl_find_msg (domain_file, domainbinding, msgid, convert, lengthp)
 	  if (__builtin_expect (encoding == NULL, 0))
 	    /* Nothing we can do, no more memory.  We cannot use the
 	       translation because it might be encoded incorrectly.  */
-	    return (char *) -1;
+	    goto unlock_fail;
 
 	  convd = &new_conversions[nconversions];
 	  convd->encoding = encoding;
@@ -989,6 +1013,9 @@ _nl_find_msg (domain_file, domainbinding, msgid, convert, lengthp)
 	  convd->conv_tab = NULL;
 	  /* Here domain->conversions is still == new_conversions.  */
 	  domain->nconversions++;
+
+	found_convd:
+	  __libc_rwlock_unlock (domain->conversions_lock);
 	}
 
       if (
diff --git a/intl/loadmsgcat.c b/intl/loadmsgcat.c
index 1c47475ec6..537fd6013c 100644
--- a/intl/loadmsgcat.c
+++ b/intl/loadmsgcat.c
@@ -1,5 +1,5 @@
 /* Load needed message catalogs.
-   Copyright (C) 1995-2005 Free Software Foundation, Inc.
+   Copyright (C) 1995-2005, 2007 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -1252,6 +1252,7 @@ _nl_load_domain (domain_file, domainbinding)
   /* No caches of converted translations so far.  */
   domain->conversions = NULL;
   domain->nconversions = 0;
+  __libc_rwlock_init (domain->conversions_lock);
 
   /* Get the header entry and look for a plural specification.  */
   nullentry = _nl_find_msg (domain_file, domainbinding, "", 0, &nullentrylen);
@@ -1290,6 +1291,7 @@ _nl_unload_domain (domain)
     }
   if (domain->conversions != NULL)
     free (domain->conversions);
+  __libc_rwlock_fini (domain->conversions_lock);
 
   if (domain->malloced)
     free (domain->malloced);