From: Ruchi Kandoi <kandoiruchi@google.com>
Date: Tue, 10 Nov 2015 18:53:55 +0000 (-0800)
Subject: wakeup: Add the guard condition for len in pm_get_active_wakeup_sources
X-Git-Tag: firefly_0821_release~2958^2~81
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=594354108648b4e58810a87b3539fec31bda903b;p=firefly-linux-kernel-4.4.55.git

wakeup: Add the guard condition for len in pm_get_active_wakeup_sources

Check if the len is not greater than maximum to prevent buffer overflow.

Signed-off-by: Ruchi Kandoi <kandoiruchi@google.com>
Change-Id: I575b0a72bb5448b68353408d71fa8b83420c9088
---

diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
index 305d6dd6bdef..09c07f519952 100644
--- a/drivers/base/power/wakeup.c
+++ b/drivers/base/power/wakeup.c
@@ -813,7 +813,7 @@ void pm_get_active_wakeup_sources(char *pending_wakeup_source, size_t max)
 
 	rcu_read_lock();
 	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
-		if (ws->active) {
+		if (ws->active && len < max) {
 			if (!active)
 				len += scnprintf(pending_wakeup_source, max,
 						"Pending Wakeup Sources: ");