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292a089d78
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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| .. | ||
| aircable.c | ||
| ark3116.c | ||
| belkin_sa.c | ||
| belkin_sa.h | ||
| bus.c | ||
| ch341.c | ||
| console.c | ||
| cp210x.c | ||
| cyberjack.c | ||
| cypress_m8.c | ||
| cypress_m8.h | ||
| digi_acceleport.c | ||
| empeg.c | ||
| ezusb_convert.pl | ||
| f81232.c | ||
| f81534.c | ||
| ftdi_sio.c | ||
| ftdi_sio.h | ||
| ftdi_sio_ids.h | ||
| garmin_gps.c | ||
| generic.c | ||
| io_16654.h | ||
| io_edgeport.c | ||
| io_edgeport.h | ||
| io_ionsp.h | ||
| io_ti.c | ||
| io_ti.h | ||
| io_usbvend.h | ||
| ipaq.c | ||
| ipw.c | ||
| ir-usb.c | ||
| iuu_phoenix.c | ||
| iuu_phoenix.h | ||
| Kconfig | ||
| keyspan.c | ||
| keyspan_pda.c | ||
| keyspan_usa26msg.h | ||
| keyspan_usa28msg.h | ||
| keyspan_usa49msg.h | ||
| keyspan_usa67msg.h | ||
| keyspan_usa90msg.h | ||
| kl5kusb105.c | ||
| kl5kusb105.h | ||
| kobil_sct.c | ||
| kobil_sct.h | ||
| Makefile | ||
| Makefile-keyspan_pda_fw | ||
| mct_u232.c | ||
| mct_u232.h | ||
| metro-usb.c | ||
| mos7720.c | ||
| mos7840.c | ||
| mxuport.c | ||
| navman.c | ||
| omninet.c | ||
| opticon.c | ||
| option.c | ||
| oti6858.c | ||
| oti6858.h | ||
| pl2303.c | ||
| pl2303.h | ||
| qcaux.c | ||
| qcserial.c | ||
| quatech2.c | ||
| safe_serial.c | ||
| sierra.c | ||
| spcp8x5.c | ||
| ssu100.c | ||
| symbolserial.c | ||
| ti_usb_3410_5052.c | ||
| upd78f0730.c | ||
| usb-serial-simple.c | ||
| usb-serial.c | ||
| usb-wwan.h | ||
| usb_debug.c | ||
| usb_wwan.c | ||
| visor.c | ||
| visor.h | ||
| whiteheat.c | ||
| whiteheat.h | ||
| wishbone-serial.c | ||
| xr_serial.c | ||
| xsens_mt.c | ||