From: Kangjie Lu <kjlu@umn.edu>
To: kjlu@umn.edu
Cc: pakki001@umn.edu, Jacek Anaszewski <jacek.anaszewski@gmail.com>,
Pavel Machek <pavel@ucw.cz>,
linux-leds@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] leds: fix a missing check of return value of lp55xx_read
Date: Tue, 25 Dec 2018 22:18:23 -0600 [thread overview]
Message-ID: <20181226041823.73950-1-kjlu@umn.edu> (raw)
When lp55xx_read() fails, "status" is an uninitialized variable and thus
may contain random value; using it leads to undefined behaviors.
The fix inserts a check for the return value of lp55xx_read: if it
fails, returns with its error code.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
---
drivers/leds/leds-lp5523.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/leds/leds-lp5523.c b/drivers/leds/leds-lp5523.c
index a2e74feee2b2..fd64df5a57a5 100644
--- a/drivers/leds/leds-lp5523.c
+++ b/drivers/leds/leds-lp5523.c
@@ -318,7 +318,9 @@ static int lp5523_init_program_engine(struct lp55xx_chip *chip)
/* Let the programs run for couple of ms and check the engine status */
usleep_range(3000, 6000);
- lp55xx_read(chip, LP5523_REG_STATUS, &status);
+ ret = lp55xx_read(chip, LP5523_REG_STATUS, &status);
+ if (ret)
+ return ret;
status &= LP5523_ENG_STATUS_MASK;
if (status != LP5523_ENG_STATUS_MASK) {
--
2.17.2 (Apple Git-113)
next reply other threads:[~2018-12-26 4:18 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-12-26 4:18 Kangjie Lu [this message]
2018-12-28 16:52 ` Jacek Anaszewski
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