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authorSteven Rostedt (Google) <rostedt@goodmis.org>2022-12-20 13:45:19 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2022-12-25 13:38:09 -0800
commit292a089d78d3e2f7944e60bb897c977785a321e3 (patch)
treec9bdd3ea73fe57a35b358770998396cbc5813031 /drivers/isdn
parent72a85e2b0a1e1e6fb4ee51ae902730212b2de25c (diff)
treewide: Convert del_timer*() to timer_shutdown*()
Due to several bugs caused by timers being re-armed after they are shutdown and just before they are freed, a new state of timers was added called "shutdown". After a timer is set to this state, then it can no longer be re-armed. The following script was run to find all the trivial locations where del_timer() or del_timer_sync() is called in the same function that the object holding the timer is freed. It also ignores any locations where the timer->function is modified between the del_timer*() and the free(), as that is not considered a "trivial" case. This was created by using a coccinelle script and the following commands: $ cat timer.cocci @@ expression ptr, slab; identifier timer, rfield; @@ ( - del_timer(&ptr->timer); + timer_shutdown(&ptr->timer); | - del_timer_sync(&ptr->timer); + timer_shutdown_sync(&ptr->timer); ) ... when strict when != ptr->timer ( kfree_rcu(ptr, rfield); | kmem_cache_free(slab, ptr); | kfree(ptr); ) $ spatch timer.cocci . > /tmp/t.patch $ patch -p1 < /tmp/t.patch Link: https://lore.kernel.org/lkml/20221123201306.823305113@linutronix.de/ Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org> Acked-by: Pavel Machek <pavel@ucw.cz> [ LED ] Acked-by: Kalle Valo <kvalo@kernel.org> [ wireless ] Acked-by: Paolo Abeni <pabeni@redhat.com> [ networking ] Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/isdn')
-rw-r--r--drivers/isdn/mISDN/l1oip_core.c4
-rw-r--r--drivers/isdn/mISDN/timerdev.c4
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index c24771336f61..f010b35a0531 100644
--- a/drivers/isdn/mISDN/l1oip_core.c
+++ b/drivers/isdn/mISDN/l1oip_core.c
@@ -1236,8 +1236,8 @@ release_card(struct l1oip *hc)
hc->shutdown = true;
- del_timer_sync(&hc->keep_tl);
- del_timer_sync(&hc->timeout_tl);
+ timer_shutdown_sync(&hc->keep_tl);
+ timer_shutdown_sync(&hc->timeout_tl);
cancel_work_sync(&hc->workq);
diff --git a/drivers/isdn/mISDN/timerdev.c b/drivers/isdn/mISDN/timerdev.c
index abdf36ac3bee..83d6b484d3c6 100644
--- a/drivers/isdn/mISDN/timerdev.c
+++ b/drivers/isdn/mISDN/timerdev.c
@@ -74,7 +74,7 @@ mISDN_close(struct inode *ino, struct file *filep)
while (!list_empty(list)) {
timer = list_first_entry(list, struct mISDNtimer, list);
spin_unlock_irq(&dev->lock);
- del_timer_sync(&timer->tl);
+ timer_shutdown_sync(&timer->tl);
spin_lock_irq(&dev->lock);
/* it might have been moved to ->expired */
list_del(&timer->list);
@@ -204,7 +204,7 @@ misdn_del_timer(struct mISDNtimerdev *dev, int id)
list_del_init(&timer->list);
timer->id = -1;
spin_unlock_irq(&dev->lock);
- del_timer_sync(&timer->tl);
+ timer_shutdown_sync(&timer->tl);
kfree(timer);
return id;
}