Commit 0761f58c authored Dec 25, 2018 by Kangjie Lu Committed by Greg Kroah-Hartman Feb 27, 2019

leds: lp5523: fix a missing check of return value of lp55xx_read



[ Upstream commit 248b57015f35c94d4eae2fdd8c6febf5cd703900 ]

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>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

parent ddb8d7c9

drivers/leds/leds-lp5523.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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) {