audit: destroy long filenames correctly

filename should be destroyed via final_putname() instead of __putname()
Otherwise this result in following BUGON() in case of long names:
  kernel BUG at mm/slab.c:3006!
  Call Trace:
  kmem_cache_free+0x1c1/0x850
  audit_putname+0x88/0x90
  putname+0x73/0x80
  sys_symlinkat+0x120/0x150
  sys_symlink+0x16/0x20
  system_call_fastpath+0x16/0x1b

Introduced-in: 7950e3852

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Eric Paris <eparis@redhat.com>

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 77c705c302f7a70b093d6e252cdca1e98113272d..b59ffb293dedf17b8ca4eb64eb1785ecb37ad2de 100644 (file)
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1024,7 +1024,7 @@ static inline void audit_free_names(struct audit_context *context)
        list_for_each_entry_safe(n, next, &context->names_list, list) {
                list_del(&n->list);
                if (n->name && n->name_put)
-                       __putname(n->name);
+                       final_putname(n->name);
                if (n->should_free)
                        kfree(n);
        }
@@ -2050,7 +2050,7 @@ void audit_putname(struct filename *name)
        BUG_ON(!context);
        if (!context->in_syscall) {
 #if AUDIT_DEBUG == 2
-               printk(KERN_ERR "%s:%d(:%d): __putname(%p)\n",
+               printk(KERN_ERR "%s:%d(:%d): final_putname(%p)\n",
                       __FILE__, __LINE__, context->serial, name);
                if (context->name_count) {
                        struct audit_names *n;
@@ -2061,7 +2061,7 @@ void audit_putname(struct filename *name)
                                       n->name, n->name->name ?: "(null)");
                        }
 #endif
-               __putname(name);
+               final_putname(name);
        }
 #if AUDIT_DEBUG
        else {