linux-kernel - [PATCH] [media] dvb_frontend: ensure that front end status is initialized

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Message-Id: <20170720152916.24266-1-colin.king@canonical.com>
Date:   Thu, 20 Jul 2017 16:29:16 +0100
From:   Colin King <colin.king@...onical.com>
To:     Max Kellermann <max.kellermann@...il.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Markus Elfring <elfring@...rs.sourceforge.net>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Shuah Khan <shuah@...nel.org>, linux-media@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [media] dvb_frontend: ensure that front end status is initialized

From: Colin Ian King <colin.king@...onical.com>

The fe_status variable s is not initialized meaning it can have any
random garbage status.  This could be problematic if fe->ops.tune is
false as s is not updated by the call to fe->ops.tune() and a
subsequent check on the change status will using a garbage value.
Fix this by initializing s to zero.

Detected by CoverityScan, CID#112887 ("Uninitialized scalar variable")

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/media/dvb-core/dvb_frontend.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/dvb-core/dvb_frontend.c b/drivers/media/dvb-core/dvb_frontend.c
index e3fff8f64d37..e18ea1508a59 100644
--- a/drivers/media/dvb-core/dvb_frontend.c
+++ b/drivers/media/dvb-core/dvb_frontend.c
@@ -631,7 +631,7 @@ static int dvb_frontend_thread(void *data)
 	struct dvb_frontend *fe = data;
 	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
 	struct dvb_frontend_private *fepriv = fe->frontend_priv;
-	enum fe_status s;
+	enum fe_status s = 0;
 	enum dvbfe_algo algo;
 	bool re_tune = false;
 	bool semheld = false;
-- 
2.11.0