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authorBen Dai <ben.dai@unisoc.com>2021-04-25 23:09:03 +0800
committerThomas Gleixner <tglx@linutronix.de>2021-08-10 15:39:00 +0200
commitb9cc7d8a4656a6e815852c27ab50365009cb69c1 (patch)
treeeedd846b978aa1c7783fdd1c5e281715c558044f /kernel/irq/timings.c
parentff363f480e5997051dd1de949121ffda3b753741 (diff)
genirq/timings: Prevent potential array overflow in __irq_timings_store()
When the interrupt interval is greater than 2 ^ PREDICTION_BUFFER_SIZE * PREDICTION_FACTOR us and less than 1s, the calculated index will be greater than the length of irqs->ema_time[]. Check the calculated index before using it to prevent array overflow. Fixes: 23aa3b9a6b7d ("genirq/timings: Encapsulate storing function") Signed-off-by: Ben Dai <ben.dai@unisoc.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20210425150903.25456-1-ben.dai9703@gmail.com
Diffstat (limited to 'kernel/irq/timings.c')
-rw-r--r--kernel/irq/timings.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/irq/timings.c b/kernel/irq/timings.c
index d309d6fbf5bd..4d2a702d7aa9 100644
--- a/kernel/irq/timings.c
+++ b/kernel/irq/timings.c
@@ -453,6 +453,11 @@ static __always_inline void __irq_timings_store(int irq, struct irqt_stat *irqs,
*/
index = irq_timings_interval_index(interval);
+ if (index > PREDICTION_BUFFER_SIZE - 1) {
+ irqs->count = 0;
+ return;
+ }
+
/*
* Store the index as an element of the pattern in another
* circular array.