From: Ben Dai ben.dai@unisoc.com
stable inclusion from stable-5.10.60 commit 2d2c668480278dffcd0167b012d196e30d953b09 bugzilla: 177018 https://gitee.com/openeuler/kernel/issues/I4EAUG
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit b9cc7d8a4656a6e815852c27ab50365009cb69c1 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- kernel/irq/timings.c | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/kernel/irq/timings.c b/kernel/irq/timings.c index 773b6105c4ae..6990490fa67b 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.