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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>
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| .. | ||
| bcm63xx_pcmcia.c | ||
| bcm63xx_pcmcia.h | ||
| cardbus.c | ||
| cirrus.h | ||
| cistpl.c | ||
| cs.c | ||
| cs_internal.h | ||
| db1xxx_ss.c | ||
| ds.c | ||
| electra_cf.c | ||
| i82092.c | ||
| i82092aa.h | ||
| i82365.c | ||
| i82365.h | ||
| Kconfig | ||
| Makefile | ||
| max1600.c | ||
| max1600.h | ||
| o2micro.h | ||
| omap_cf.c | ||
| pcmcia_cis.c | ||
| pcmcia_resource.c | ||
| pd6729.c | ||
| pd6729.h | ||
| pxa2xx_base.c | ||
| pxa2xx_base.h | ||
| pxa2xx_mainstone.c | ||
| pxa2xx_sharpsl.c | ||
| ricoh.h | ||
| rsrc_iodyn.c | ||
| rsrc_mgr.c | ||
| rsrc_nonstatic.c | ||
| sa11xx_base.c | ||
| sa11xx_base.h | ||
| sa1100_generic.c | ||
| sa1100_generic.h | ||
| sa1100_h3600.c | ||
| sa1100_simpad.c | ||
| sa1111_badge4.c | ||
| sa1111_generic.c | ||
| sa1111_generic.h | ||
| sa1111_jornada720.c | ||
| sa1111_lubbock.c | ||
| sa1111_neponset.c | ||
| soc_common.c | ||
| soc_common.h | ||
| socket_sysfs.c | ||
| tcic.c | ||
| tcic.h | ||
| ti113x.h | ||
| topic.h | ||
| vg468.h | ||
| xxs1500_ss.c | ||
| yenta_socket.c | ||
| yenta_socket.h | ||