linux-kernel - [PATCH] module: Fix load

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Message-ID: <20150708124127.GV18673@twins.programming.kicks-ass.net>
Date:	Wed, 8 Jul 2015 14:41:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arthur Marsh <arthur.marsh@...ernode.on.net>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	rostedt <rostedt@...dmis.org>, Oleg Nesterov <oleg@...hat.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH] module: Fix load_module() error path

On Wed, Jul 08, 2015 at 02:32:44PM +0200, Peter Zijlstra wrote:

> Awesome, lemme go write up a proper patch to make Rusty happy too ;-)

---
Subject: module: Fix load_module() error path
From: Peter Zijlstra <peterz@...radead.org>
Date: Wed Jul 8 14:35:58 CEST 2015

The load_module() error path frees a module but forgot to take it out
of the mod_tree, leaving a dangling entry in the tree, causing havoc.

Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Reported-by: Arthur Marsh <arthur.marsh@...ernode.on.net>
Tested-by: Arthur Marsh <arthur.marsh@...ernode.on.net>
Fixes: 93c2e105f6bc ("module: Optimize __module_address() using a latched RB-tree")
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 kernel/module.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3557,6 +3557,7 @@ static int load_module(struct load_info
 	mutex_lock(&module_mutex);
 	/* Unlink carefully: kallsyms could be walking list. */
 	list_del_rcu(&mod->list);
+	mod_tree_remove(mod);
 	wake_up_all(&module_wq);
 	/* Wait for RCU-sched synchronizing before releasing mod->list. */
 	synchronize_sched();
--
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