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| author | Ben Dai <ben.dai@unisoc.com> | 2021-04-25 17:09:03 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-08-10 15:39:00 +0200 |
| commit | b9cc7d8a4656a6e815852c27ab50365009cb69c1 (patch) | |
| tree | eedd846b978aa1c7783fdd1c5e281715c558044f /kernel/irq/timings.c | |
| parent | x86/msi: Force affinity setup before startup (diff) | |
| download | linux-b9cc7d8a4656a6e815852c27ab50365009cb69c1.tar.xz linux-b9cc7d8a4656a6e815852c27ab50365009cb69c1.zip | |
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.c | 5 |
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. |