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Date: Fri, 22 Mar 2019 12:13:49 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Kangjie Lu <kjlu@....edu>, Jacek Anaszewski <jacek.anaszewski@...il.com>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 3.18 016/134] leds: lp5523: fix a missing check of return value of lp55xx_read 3.18-stable review patch. If anyone has any objections, please let me know. ------------------ [ 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@....edu> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 9e1716f8098ca..20e43f8b93256 100644 --- a/drivers/leds/leds-lp5523.c +++ b/drivers/leds/leds-lp5523.c @@ -313,7 +313,9 @@ 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) { -- 2.19.1
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