[PATCH v2] hrtimer: check hrtimer with a NULL function

Phil Chang
2024-06-07T02:26:22Z

Since hrtimers do not allow a NULL function to be passed,
to prevent a kernel crash, return before adding the timer to a queue.

Signed-off-by: Phil Chang <phil.chang@mediatek.com>
---
kernel/time/hrtimer.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
index 492c14aac642..d32c1afe59b3 100644
--- a/kernel/time/hrtimer.c
+++ b/kernel/time/hrtimer.c
@@ -1285,6 +1285,9 @@ void hrtimer_start_range_ns(struct hrtimer *timer, ktime_t tim,
struct hrtimer_clock_base *base;
unsigned long flags;

+ if (WARN_ON(!timer->function))
+ return;
+
/*
* Check whether the HRTIMER_MODE_SOFT bit and hrtimer.is_soft
* match on CONFIG_PREEMPT_RT = n. With PREEMPT_RT check the hard
--
2.18.0