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authorKrzysztof Kozlowski <krzysztof.kozlowski@canonical.com>2021-04-19 19:33:33 +0300
committerSebastian Reichel <sebastian.reichel@collabora.com>2021-04-20 17:18:08 +0300
commita837f35c5ae0b0fb2b2b6bc1765b7be5a44b0a19 (patch)
tree42973736890a4cd2dfcd7e3f605575de61723bed /drivers/power
parent01dcfe7849875db439d24600d6d89ef40ae97eac (diff)
downloadlinux-a837f35c5ae0b0fb2b2b6bc1765b7be5a44b0a19.tar.xz
power: supply: max17040: handle device_property_read_u8_array() failure
The device_property_read_u8_array() call should not fail because it is preceded with device_property_count_u8() and check for number of readable u8 values. However the code is more obvious and easier to read if the return value of device_property_read_u8_array() is checked. Otherwise reader needs to investigate whether really there is no risk of using random stack values of 'rcomp' variable. Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/supply/max17040_battery.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index d956c67d5155..d2053cd0bd13 100644
--- a/drivers/power/supply/max17040_battery.c
+++ b/drivers/power/supply/max17040_battery.c
@@ -268,11 +268,10 @@ static int max17040_get_of_data(struct max17040_chip *chip)
rcomp_len = device_property_count_u8(dev, "maxim,rcomp");
chip->rcomp = MAX17040_RCOMP_DEFAULT;
if (rcomp_len == data->rcomp_bytes) {
- device_property_read_u8_array(dev, "maxim,rcomp",
- rcomp, rcomp_len);
- chip->rcomp = rcomp_len == 2 ?
- rcomp[0] << 8 | rcomp[1] :
- rcomp[0] << 8;
+ if (!device_property_read_u8_array(dev, "maxim,rcomp",
+ rcomp, rcomp_len))
+ chip->rcomp = rcomp_len == 2 ? rcomp[0] << 8 | rcomp[1] :
+ rcomp[0] << 8;
} else if (rcomp_len > 0) {
dev_err(dev, "maxim,rcomp has incorrect length\n");
return -EINVAL;