linux-kernel - [PATCH] module: Call module notifier on failure after complete

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Message-ID: <20150508111736.64d5176a@gandalf.local.home>
Date:	Fri, 8 May 2015 11:17:36 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	stable <stable@...r.kernel.org>,
	Pontus Fuchs <pontus.fuchs@...il.com>
Subject: [PATCH] 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@...il.com>
Fixes: 4982223e51e8 "module: set nx before marking module MODULE_STATE_COMING"
Cc: stable@...r.kernel.org # 3.16+
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/module.c | 3 +++
 1 file changed, 3 insertions(+)

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);
-- 
1.8.3.1

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