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authorKangjie Lu <kjlu@umn.edu>2018-12-25 22:18:23 -0600
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2019-01-17 22:27:39 +0100
commit248b57015f35c94d4eae2fdd8c6febf5cd703900 (patch)
tree880652e44f82321bb1c3130f2636b42ce80d2b2a
parentbfeffd155283772bbe78c6a05dec7c0128ee500c (diff)
downloadlinux-248b57015f35c94d4eae2fdd8c6febf5cd703900.tar.bz2
leds: lp5523: fix a missing check of return value of lp55xx_read
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>
-rw-r--r--drivers/leds/leds-lp5523.c4
1 files changed, 3 insertions, 1 deletions
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) {