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From: Greg KH on 30 Jul 2010 13:40
2.6.33-stable review patch. If anyone has any objections, please let us know.

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

From: Jason Baron <jbaron(a)redhat.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(a)redhat.com>
Reported-by: Thomas Renninger <trenn(a)suse.de>
Tested-by: Thomas Renninger <trenn(a)suse.de>
Signed-off-by: Andrew Morton <akpm(a)linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

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

--- a/kernel/module.c
+++ b/kernel/module.c
@@ -720,7 +720,6 @@ 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:
@@ -1383,6 +1382,9 @@ 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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