linux-kernel - [PATCH] leds: blinkm: avoid uninitialized data use

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Message-Id: <20171204144538.304782-1-arnd@arndb.de>
Date:   Mon,  4 Dec 2017 15:45:29 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Jan-Simon Moeller <jansimon.moeller@....de>,
        Richard Purdie <rpurdie@...ys.net>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] leds: blinkm: avoid uninitialized data use

gcc-8 reports missing error handling in blinkm_detect, when blinkm()
fails, tmpargs[] is uninitialized:

drivers/leds/leds-blinkm.c: In function 'blinkm_detect':
drivers/leds/leds-blinkm.c:555:6: error: 'tmpargs' may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds a missing error checks.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/leds/leds-blinkm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/leds/leds-blinkm.c b/drivers/leds/leds-blinkm.c
index d03ed6b4176b..851c1920b63c 100644
--- a/drivers/leds/leds-blinkm.c
+++ b/drivers/leds/leds-blinkm.c
@@ -549,8 +549,12 @@ static int blinkm_detect(struct i2c_client *client, struct i2c_board_info *info)
 	/* make sure the blinkM is balanced (read/writes) */
 	while (count > 0) {
 		ret = blinkm_write(client, BLM_GET_ADDR, NULL);
+		if (ret)
+			return ret;
 		usleep_range(5000, 10000);
 		ret = blinkm_read(client, BLM_GET_ADDR, tmpargs);
+		if (ret)
+			return ret;
 		usleep_range(5000, 10000);
 		if (tmpargs[0] == 0x09)
 			count = 0;
-- 
2.9.0