module: Call module notifier on failure after complete_formation()

The module notifier call chain for MODULE_STATE_COMING was moved up before
the parsing of args, into the complete_formation() call. But if the module failed
to load after that, the notifier call chain for MODULE_STATE_GOING was
never called and that prevented the users of those call chains from
cleaning up anything that was allocated.

Link: http://lkml.kernel.org/r/554C52B9.9060700@gmail.com

Reported-by: Pontus Fuchs <pontus.fuchs@gmail.com>
Fixes: 4982223e51e8 "module: set nx before marking module MODULE_STATE_COMING"
Cc: stable@vger.kernel.org # 3.16+
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/module.c b/kernel/module.c
index 42a1d2afb217..cfc9e843a924 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3370,6 +3370,9 @@ static int load_module(struct load_info *info, const char __user *uargs,
         module_bug_cleanup(mod);
         mutex_unlock(&module_mutex);
 
+        blocking_notifier_call_chain(&module_notify_list,
+                                     MODULE_STATE_GOING, mod);
+
         /* we can't deallocate the module until we clear memory protection */
         unset_module_init_ro_nx(mod);
         unset_module_core_ro_nx(mod);