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authorBart Van Assche <bvanassche@acm.org>2019-03-11 16:02:55 -0700
committerThomas Gleixner <tglx@linutronix.de>2019-03-21 12:00:18 +0100
commit82efcab3b9f3ef59e9713237c6e3c05c3a95c1ae (patch)
tree3bbd3c0bb9bd14f7274279c711c2d9940a9bd098 /kernel
parent9e98c678c2d6ae3a17cb2de55d17f69dddaa231b (diff)
workqueue: Only unregister a registered lockdep key
The recent change to prevent use after free and a memory leak introduced an unconditional call to wq_unregister_lockdep() in the error handling path. If the lockdep key had not been registered yet, then the lockdep core emits a warning. Only call wq_unregister_lockdep() if wq_register_lockdep() has been called first. Fixes: 009bb421b6ce ("workqueue, lockdep: Fix an alloc_workqueue() error path") Reported-by: syzbot+be0c198232f86389c3dd@syzkaller.appspotmail.com Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Tejun Heo <tj@kernel.org> Cc: Qian Cai <cai@lca.pw> Link: https://lkml.kernel.org/r/20190311230255.176081-1-bvanassche@acm.org
Diffstat (limited to 'kernel')
-rw-r--r--kernel/workqueue.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 4026d1871407..ddee541ea97a 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4266,7 +4266,7 @@ struct workqueue_struct *alloc_workqueue(const char *fmt,
INIT_LIST_HEAD(&wq->list);
if (alloc_and_link_pwqs(wq) < 0)
- goto err_free_wq;
+ goto err_unreg_lockdep;
if (wq_online && init_rescuer(wq) < 0)
goto err_destroy;
@@ -4292,9 +4292,10 @@ struct workqueue_struct *alloc_workqueue(const char *fmt,
return wq;
-err_free_wq:
+err_unreg_lockdep:
wq_unregister_lockdep(wq);
wq_free_lockdep(wq);
+err_free_wq:
free_workqueue_attrs(wq->unbound_attrs);
kfree(wq);
return NULL;