From 9e28989d41c0eab57ec0bb156617a8757406ff8a Mon Sep 17 00:00:00 2001
From: Kangjie Lu <kjlu@umn.edu>
Date: Thu, 20 Dec 2018 15:12:11 -0600
Subject: [PATCH] mfd: mc13xxx: Fix a missing check of a register-read failure
Git-commit: 9e28989d41c0eab57ec0bb156617a8757406ff8a
Patch-mainline: v5.0-rc3
References: bsc#1051510
When mc13xxx_reg_read() fails, "old_adc0" is uninitialized and will
contain random value. Further execution uses "old_adc0" even when
mc13xxx_reg_read() fails.
The fix checks the return value of mc13xxx_reg_read(), and exits
the execution when it fails.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/mfd/mc13xxx-core.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/mfd/mc13xxx-core.c
+++ b/drivers/mfd/mc13xxx-core.c
@@ -274,7 +274,9 @@ int mc13xxx_adc_do_conversion(struct mc1
mc13xxx->adcflags |= MC13XXX_ADC_WORKING;
- mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);
+ ret = mc13xxx_reg_read(mc13xxx, MC13XXX_ADC0, &old_adc0);
+ if (ret)
+ goto out;
adc0 = MC13XXX_ADC0_ADINC1 | MC13XXX_ADC0_ADINC2 |
MC13XXX_ADC0_CHRGRAWDIV;