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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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.. | ||
Kconfig | ||
Makefile | ||
pvrusb2-audio.c | ||
pvrusb2-audio.h | ||
pvrusb2-context.c | ||
pvrusb2-context.h | ||
pvrusb2-cs53l32a.c | ||
pvrusb2-cs53l32a.h | ||
pvrusb2-ctrl.c | ||
pvrusb2-ctrl.h | ||
pvrusb2-cx2584x-v4l.c | ||
pvrusb2-cx2584x-v4l.h | ||
pvrusb2-debug.h | ||
pvrusb2-debugifc.c | ||
pvrusb2-debugifc.h | ||
pvrusb2-devattr.c | ||
pvrusb2-devattr.h | ||
pvrusb2-dvb.c | ||
pvrusb2-dvb.h | ||
pvrusb2-eeprom.c | ||
pvrusb2-eeprom.h | ||
pvrusb2-encoder.c | ||
pvrusb2-encoder.h | ||
pvrusb2-fx2-cmd.h | ||
pvrusb2-hdw-internal.h | ||
pvrusb2-hdw.c | ||
pvrusb2-hdw.h | ||
pvrusb2-i2c-core.c | ||
pvrusb2-i2c-core.h | ||
pvrusb2-io.c | ||
pvrusb2-io.h | ||
pvrusb2-ioread.c | ||
pvrusb2-ioread.h | ||
pvrusb2-main.c | ||
pvrusb2-std.c | ||
pvrusb2-std.h | ||
pvrusb2-sysfs.c | ||
pvrusb2-sysfs.h | ||
pvrusb2-util.h | ||
pvrusb2-v4l2.c | ||
pvrusb2-v4l2.h | ||
pvrusb2-video-v4l.c | ||
pvrusb2-video-v4l.h | ||
pvrusb2-wm8775.c | ||
pvrusb2-wm8775.h | ||
pvrusb2.h |