The following commit has been merged into the timers/core branch of tip: Commit-ID: 2f117484329b233455ee278f2d9b0a4356835060 Gitweb: https://git.kernel.org/tip/2f117484329b233455ee278f2d9b0a4356835060 Author: Barnabás Pőcze <pobrn@xxxxxxxxxxxxxx> AuthorDate: Mon, 14 Nov 2022 19:54:23 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitterDate: Thu, 17 Nov 2022 11:26:20 +01:00 timerqueue: Use rb_entry_safe() in timerqueue_getnext() When `timerqueue_getnext()` is called on an empty timer queue, it will use `rb_entry()` on a NULL pointer, which is invalid. Fix that by using `rb_entry_safe()` which handles NULL pointers. This has not caused any issues so far because the offset of the `rb_node` member in `timerqueue_node` is 0, so `rb_entry()` is essentially a no-op. Fixes: 511885d7061e ("lib/timerqueue: Rely on rbtree semantics for next timer") Signed-off-by: Barnabás Pőcze <pobrn@xxxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20221114195421.342929-1-pobrn@xxxxxxxxxxxxxx --- include/linux/timerqueue.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/timerqueue.h b/include/linux/timerqueue.h index 9388408..adc80e2 100644 --- a/include/linux/timerqueue.h +++ b/include/linux/timerqueue.h @@ -35,7 +35,7 @@ struct timerqueue_node *timerqueue_getnext(struct timerqueue_head *head) { struct rb_node *leftmost = rb_first_cached(&head->rb_root); - return rb_entry(leftmost, struct timerqueue_node, node); + return rb_entry_safe(leftmost, struct timerqueue_node, node); } static inline void timerqueue_init(struct timerqueue_node *node)
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