Patchwork [89/93] module: fix missing module_mutex unlock

login
register
mail settings
Submitter Herton Ronaldo Krzesinski
Date Feb. 5, 2013, 10:07 p.m.
Message ID <1360102042-10732-90-git-send-email-herton.krzesinski@canonical.com>
Download mbox | patch
Permalink /patch/218449/
State New
Headers show

Comments

Herton Ronaldo Krzesinski - Feb. 5, 2013, 10:07 p.m.
3.5.7.5 -stable review patch.  If anyone has any objections, please let me know.

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

From: Linus Torvalds <torvalds@linux-foundation.org>

commit ee61abb3223e28a1a14a8429c0319755d20d3e40 upstream.

Commit 1fb9341ac348 ("module: put modules in list much earlier") moved
some of the module initialization code around, and in the process
changed the exit paths too.  But for the duplicate export symbol error
case the change made the ddebug_cleanup path jump to after the module
mutex unlock, even though it happens with the mutex held.

Rusty has some patches to split this function up into some helper
functions, hopefully the mess of complex goto targets will go away
eventually.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com>
---
 kernel/module.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/kernel/module.c b/kernel/module.c
index 19716ac..2ad732d1 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3033,8 +3033,8 @@  again:
 	/* module_bug_cleanup needs module_mutex protection */
 	mutex_lock(&module_mutex);
 	module_bug_cleanup(mod);
-	mutex_unlock(&module_mutex);
  ddebug_cleanup:
+	mutex_unlock(&module_mutex);
 	dynamic_debug_remove(info.debug);
 	synchronize_sched();
 	kfree(mod->args);