linux-kernel - [PATCH] media/lgdt3306a: Add a missing return value check.

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Message-Id: <20181224152903.15828-1-pakki001@umn.edu>
Date:   Mon, 24 Dec 2018 09:29:01 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Brad Love <brad@...tdimension.cc>,
        Michael Ira Krufky <mkrufky@...uxtv.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media/lgdt3306a: Add a missing return value check.

In lgdt3306a.c, lgdt3306a_read_signal_strength() can fail while reading
the registers via lgdt3306a_read_reg(). The function can return an error
from i2c_transfer(). The fix checks the return value for this failure.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/media/dvb-frontends/lgdt3306a.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/lgdt3306a.c b/drivers/media/dvb-frontends/lgdt3306a.c
index 0e1f5daaf20c..b79f652d05e1 100644
--- a/drivers/media/dvb-frontends/lgdt3306a.c
+++ b/drivers/media/dvb-frontends/lgdt3306a.c
@@ -1685,7 +1685,10 @@ static int lgdt3306a_read_signal_strength(struct dvb_frontend *fe,
 	case QAM_256:
 	case QAM_AUTO:
 		/* need to know actual modulation to set proper SNR baseline */
-		lgdt3306a_read_reg(state, 0x00a6, &val);
+		ret = lgdt3306a_read_reg(state, 0x00a6, &val);
+		if (lg_chkerr(ret))
+			goto fail;
+
 		if(val & 0x04)
 			ref_snr = 2800; /* QAM-256 28dB */
 		else
-- 
2.17.1