linux-kernel - [052/205] dynamic debug: move ddebug_remove_module() down into free

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Message-Id: <20100730175138.283128601@clark.site>
Date:	Fri, 30 Jul 2010 10:51:09 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Jason Baron <jbaron@...hat.com>
Subject: [052/205] dynamic debug: move ddebug_remove_module() down into free_module()

2.6.34-stable review patch.  If anyone has any objections, please let us know.

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

From: Jason Baron <jbaron@...hat.com>

commit b82bab4bbe9efa7bc7177fc20620fff19bd95484 upstream.

The command

	echo "file ec.c +p" >/sys/kernel/debug/dynamic_debug/control

causes an oops.

Move the call to ddebug_remove_module() down into free_module().  In this
way it should be called from all error paths.  Currently, we are missing
the remove if the module init routine fails.

Signed-off-by: Jason Baron <jbaron@...hat.com>
Reported-by: Thomas Renninger <trenn@...e.de>
Tested-by: Thomas Renninger <trenn@...e.de>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/module.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/kernel/module.c
+++ b/kernel/module.c
@@ -787,7 +787,6 @@ SYSCALL_DEFINE2(delete_module, const cha
 	mutex_lock(&module_mutex);
 	/* Store the name of the last unloaded module for diagnostic purposes */
 	strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module));
-	ddebug_remove_module(mod->name);
 	free_module(mod);
 
  out:
@@ -1455,6 +1454,9 @@ static void free_module(struct module *m
 	remove_sect_attrs(mod);
 	mod_kobject_remove(mod);
 
+	/* Remove dynamic debug info */
+	ddebug_remove_module(mod->name);
+
 	/* Arch-specific cleanup. */
 	module_arch_cleanup(mod);
 


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