Power: Add guard condition for maximum wakeup reasons

Ensure the array for the wakeup reason IRQs does not overflow.

Change-Id: Iddc57a3aeb1888f39d4e7b004164611803a4d37c
Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
(cherry picked from commit b5ea40cdfcf38296535f931a7e5e7bf47b6fad7f)

diff --git a/kernel/power/wakeup_reason.c b/kernel/power/wakeup_reason.c
index 82e69fe52d0bd092bbae6e1dc459fada3557f9a4..caf44213b14c18da136b1f03d5a073920f849c4f 100644 (file)
--- a/kernel/power/wakeup_reason.c
+++ b/kernel/power/wakeup_reason.c
@@ -79,6 +79,13 @@ void log_wakeup_reason(int irq)
                printk(KERN_INFO "Resume caused by IRQ %d\n", irq);
 
        spin_lock(&resume_reason_lock);
+       if (irq_count == MAX_WAKEUP_REASON_IRQS) {
+               spin_unlock(&resume_reason_lock);
+               printk(KERN_WARNING "Resume caused by more than %d IRQs\n",
+                               MAX_WAKEUP_REASON_IRQS);
+               return;
+       }
+
        irq_list[irq_count++] = irq;
        spin_unlock(&resume_reason_lock);
 }