From: Saravana Kannan Date: Fri, 2 Apr 2021 04:03:40 +0000 (-0700) Subject: driver core: Fix locking bug in deferred_probe_timeout_work_func() X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=eed6e41813deb9ee622cd9242341f21430d7789f;p=linux.git driver core: Fix locking bug in deferred_probe_timeout_work_func() list_for_each_entry_safe() is only useful if we are deleting nodes in a linked list within the loop. It doesn't protect against other threads adding/deleting nodes to the list in parallel. We need to grab deferred_probe_mutex when traversing the deferred_probe_pending_list. Cc: stable@vger.kernel.org Fixes: 25b4e70dcce9 ("driver core: allow stopping deferred probe after init") Signed-off-by: Saravana Kannan Link: https://lore.kernel.org/r/20210402040342.2944858-2-saravanak@google.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/base/dd.c b/drivers/base/dd.c index e2cf3b29123e8..37a5e5f8b2219 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -292,14 +292,16 @@ int driver_deferred_probe_check_state(struct device *dev) static void deferred_probe_timeout_work_func(struct work_struct *work) { - struct device_private *private, *p; + struct device_private *p; driver_deferred_probe_timeout = 0; driver_deferred_probe_trigger(); flush_work(&deferred_probe_work); - list_for_each_entry_safe(private, p, &deferred_probe_pending_list, deferred_probe) - dev_info(private->device, "deferred probe pending\n"); + mutex_lock(&deferred_probe_mutex); + list_for_each_entry(p, &deferred_probe_pending_list, deferred_probe) + dev_info(p->device, "deferred probe pending\n"); + mutex_unlock(&deferred_probe_mutex); wake_up_all(&probe_timeout_waitqueue); } static DECLARE_DELAYED_WORK(deferred_probe_timeout_work, deferred_probe_timeout_work_func);