Update.

1999-02-03  Ulrich Drepper  <drepper@cygnus.com>

	* elf/dlsym.c (dlsym_doit): If no symbol for RTLD_NEXT is found
	initialize ref element of args object so that dlsym does not dump
	a core.
	* elf/dlvsym.c (dlvsym_doit): Likewise.

ChangeLog

@@ -1,3 +1,10 @@
+1999-02-03  Ulrich Drepper  <drepper@cygnus.com>
+
+	* elf/dlsym.c (dlsym_doit): If no symbol for RTLD_NEXT is found
+	initialize ref element of args object so that dlsym does not dump
+	a core.
+	* elf/dlvsym.c (dlvsym_doit): Likewise.
+
 1999-02-03  Jakub Jelinek  <jj@ultra.linux.cz>
 
 	* sysdeps/unix/sysv/linux/sparc/sparc64/pipe.S: Set branch

elf/dlsym.c

@@ -1,5 +1,5 @@
 /* Look up a symbol in a shared object loaded by `dlopen'.
-   Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1996, 1997, 1998, 1999 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
@@ -65,6 +65,16 @@ RTLD_NEXT used in code not dynamically loaded"));
 
       args->loadbase = _dl_lookup_symbol_skip (args->name, &args->ref,
 					       l->l_local_scope, NULL, match);
+
+      if (args->loadbase == 0)
+	{
+	  /* This means that no such symbol is defined.  In this case we
+	     have to provide a phony Elfxx_Sym entry since the value is
+	     referenced in `dlsym'.  */
+	  static const ElfW(Sym) null_result;
+
+	  args->ref = &null_result;
+	}
     }
   else
     {

elf/dlvsym.c

@@ -1,5 +1,5 @@
 /* Look up a versioned symbol in a shared object loaded by `dlopen'.
-   Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1996, 1997, 1998, 1999 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
@@ -71,6 +71,16 @@ RTLD_NEXT used in code not dynamically loaded"));
 							 l->l_local_scope,
 							 NULL, &args->version,
 							 match);
+
+      if (args->loadbase == 0)
+	{
+	  /* This means that no such symbol is defined.  In this case we
+	     have to provide a phony Elfxx_Sym entry since the value is
+	     referenced in `dlsym'.  */
+	  static const ElfW(Sym) null_result;
+
+	  args->ref = &null_result;
+	}
     }
   else
     {