linux-kernel - [PATCH] media: drx: fix a missing check of return value

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Message-Id: <20181220065747.40379-1-kjlu@umn.edu>
Date:   Thu, 20 Dec 2018 00:57:44 -0600
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Mauro Carvalho Chehab <mchehab@...nel.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: drx: fix a missing check of return value

Function drxj_dap_write_reg16(), which writes data to buffer, may fail.
We need to check if it fails, and if so, we should goto error.
Otherwise, the buffer will have incorrect data.

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/media/dvb-frontends/drx39xyj/drxj.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/drx39xyj/drxj.c b/drivers/media/dvb-frontends/drx39xyj/drxj.c
index 551b7d65fa66..d105125bc1c3 100644
--- a/drivers/media/dvb-frontends/drx39xyj/drxj.c
+++ b/drivers/media/dvb-frontends/drx39xyj/drxj.c
@@ -2136,9 +2136,13 @@ int drxj_dap_atomic_read_write_block(struct i2c_device_addr *dev_addr,
 
 			word = ((u16) data[2 * i]);
 			word += (((u16) data[(2 * i) + 1]) << 8);
-			drxj_dap_write_reg16(dev_addr,
+			rc = drxj_dap_write_reg16(dev_addr,
 					     (DRXJ_HI_ATOMIC_BUF_START + i),
 					    word, 0);
+			if (rc) {
+				pr_err("error %d\n", rc);
+				goto rw_error;
+			}
 		}
 	}
 
-- 
2.17.2 (Apple Git-113)