linux-kernel - [PATCH 3.19.y-ckt 166/210] power: test_power: correctly handle empty writes

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Message-Id: <1454030348-17736-167-git-send-email-kamal@canonical.com>
Date:	Thu, 28 Jan 2016 17:18:24 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Sebastian Reichel <sre@...nel.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 166/210] power: test_power: correctly handle empty writes

3.19.8-ckt14 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Sasha Levin <sasha.levin@...cle.com>

commit 6b9140f39c2aaf76791197fbab0839c0e4af56e8 upstream.

Writing 0 length data into test_power makes it access an invalid array
location and kill the system.

Fixes: f17ef9b2d ("power: Make test_power driver more dynamic.")
Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
Signed-off-by: Sebastian Reichel <sre@...nel.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/power/test_power.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/power/test_power.c b/drivers/power/test_power.c
index 0152f35..b47bd17 100644
--- a/drivers/power/test_power.c
+++ b/drivers/power/test_power.c
@@ -275,6 +275,8 @@ static int map_get_value(struct battery_property_map *map, const char *key,
 	buf[MAX_KEYLENGTH-1] = '\0';
 
 	cr = strnlen(buf, MAX_KEYLENGTH) - 1;
+	if (cr < 0)
+		return def_val;
 	if (buf[cr] == '\n')
 		buf[cr] = '\0';
 
-- 
1.9.1