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| author | Barnabás Pőcze <pobrn@protonmail.com> | 2022-11-14 19:54:23 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2022-11-17 11:26:20 +0100 |
| commit | 2f117484329b233455ee278f2d9b0a4356835060 (patch) | |
| tree | 2448f4f715047f164f0739d7b5841bcb1f2cf189 | |
| parent | 8be3f96ceddb911539a53d87a66da84a04502366 (diff) | |
| download | linux-stable-2f117484329b233455ee278f2d9b0a4356835060.tar.gz linux-stable-2f117484329b233455ee278f2d9b0a4356835060.tar.bz2 linux-stable-2f117484329b233455ee278f2d9b0a4356835060.zip | |
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@protonmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20221114195421.342929-1-pobrn@protonmail.com
| -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) |