From: Ruchi Kandoi <kandoiruchi@google.com>
Date: Fri, 7 Mar 2014 20:54:30 +0000 (-0800)
Subject: Power: Add guard condition for maximum wakeup reasons
X-Git-Tag: firefly_0821_release~4090^2~366
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=8b531976d51c33d5ef83ca2637b08afc2ed51802;hp=eb131375b589db97c04218c0d9fb5c5873cec0bf;p=firefly-linux-kernel-4.4.55.git

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 82e69fe52d0b..caf44213b14c 100644
--- 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);
 }