diff options
| author | Barnabás Pőcze <pobrn@protonmail.com> | 2022-11-14 19:54:23 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-18 11:40:53 +0100 |
| commit | d7b9e43a5c5750a280e76926876ac6e632db0526 (patch) | |
| tree | ee41da1b01fd761d1cac864e69d47cc7a02357e7 | |
| parent | 248fa44cde6d9e120e87da551fce1b07696efea0 (diff) | |
timerqueue: Use rb_entry_safe() in timerqueue_getnext()
[ Upstream commit 2f117484329b233455ee278f2d9b0a4356835060 ]
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@protonmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221114195421.342929-1-pobrn@protonmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | include/linux/timerqueue.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/timerqueue.h b/include/linux/timerqueue.h index 93884086f392..adc80e29168e 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) |