From: Jesper Juhl <jesper.juhl@gmail.com>

If CONFIG_KALLSYMS is defined and if it should happen that is_exported() is
given a NULL 'mod' and lookup_symbol(name, __start___ksymtab,
__stop___ksymtab) returns 0, then we'll end up dereferencing a NULL
pointer.

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 kernel/module.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN kernel/module.c~ensure-null-deref-cant-possibly-happen-in-is_exported kernel/module.c
--- devel/kernel/module.c~ensure-null-deref-cant-possibly-happen-in-is_exported	2006-06-09 15:22:13.000000000 -0700
+++ devel-akpm/kernel/module.c	2006-06-09 15:22:13.000000000 -0700
@@ -1320,7 +1320,7 @@ int is_exported(const char *name, const 
 	if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
 		return 1;
 	else
-		if (lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
+		if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
 			return 1;
 		else
 			return 0;
_