linux-kernel - [PATCH 4.0 048/148] module: Call module notifier on failure after complete

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Message-Id: <20150603114207.440180587@linuxfoundation.org>
Date:	Wed,  3 Jun 2015 21:08:38 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Pontus Fuchs <pontus.fuchs@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: [PATCH 4.0 048/148] module: Call module notifier on failure after complete_formation()

4.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Steven Rostedt <rostedt@...dmis.org>

commit 37815bf866ab6722a47550f8d25ad3f1a16a680c upstream.

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@...il.com>
Fixes: 4982223e51e8 "module: set nx before marking module MODULE_STATE_COMING"
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/module.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3366,6 +3366,9 @@ static int load_module(struct load_info
 	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);


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