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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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axis-fifo | ||
board | ||
emxx_udc | ||
fbtft | ||
fieldbus | ||
gdm724x | ||
greybus | ||
iio | ||
ks7010 | ||
media | ||
most | ||
nvec | ||
octeon | ||
olpc_dcon | ||
pi433 | ||
qlge | ||
r8188eu | ||
rtl8192e | ||
rtl8192u | ||
rtl8712 | ||
rtl8723bs | ||
rts5208 | ||
sm750fb | ||
vc04_services | ||
vme_user | ||
vt6655 | ||
vt6656 | ||
wlan-ng | ||
Kconfig | ||
Makefile |