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authorSathyanarayana Nujella <sathyanarayana.nujella@intel.com>2019-09-28 13:22:30 -0700
committerMark Brown <broonie@kernel.org>2019-10-01 12:45:33 +0100
commit4bb41984bf2f4cb8ed6ec1579d317790bd941788 (patch)
treefbcc82308458785630867bd56fa1ab5603d8697f /sound/soc
parent752c938a5c14b8cbf0ed3ffbfa637fb166255c3f (diff)
downloadlinux-4bb41984bf2f4cb8ed6ec1579d317790bd941788.tar.bz2
ASoC: max98373: check for device node before parsing
Below Oops is caused in a system which uses ACPI instead of device node: of_get_named_gpiod_flags: can't parse 'maxim,reset-gpio' property of node '(null)[0]' BUG: kernel NULL pointer dereference, address: 0000000000000010 This patch avoids NULL pointer deferencing by adding a check before parsing and initializes to make reset-gpio pin as invalid. Signed-off-by: Sathyanarayana Nujella <sathyanarayana.nujella@intel.com> Signed-off-by: Jairaj Arava <jairaj.arava@intel.com> Link: https://lore.kernel.org/r/1569702150-11976-1-git-send-email-sathyanarayana.nujella@intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/codecs/max98373.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/sound/soc/codecs/max98373.c b/sound/soc/codecs/max98373.c
index e609abcf3220..eb709d528259 100644
--- a/sound/soc/codecs/max98373.c
+++ b/sound/soc/codecs/max98373.c
@@ -901,16 +901,20 @@ static void max98373_slot_config(struct i2c_client *i2c,
max98373->i_slot = value & 0xF;
else
max98373->i_slot = 1;
-
- max98373->reset_gpio = of_get_named_gpio(dev->of_node,
+ if (dev->of_node) {
+ max98373->reset_gpio = of_get_named_gpio(dev->of_node,
"maxim,reset-gpio", 0);
- if (!gpio_is_valid(max98373->reset_gpio)) {
- dev_err(dev, "Looking up %s property in node %s failed %d\n",
- "maxim,reset-gpio", dev->of_node->full_name,
- max98373->reset_gpio);
+ if (!gpio_is_valid(max98373->reset_gpio)) {
+ dev_err(dev, "Looking up %s property in node %s failed %d\n",
+ "maxim,reset-gpio", dev->of_node->full_name,
+ max98373->reset_gpio);
+ } else {
+ dev_dbg(dev, "maxim,reset-gpio=%d",
+ max98373->reset_gpio);
+ }
} else {
- dev_dbg(dev, "maxim,reset-gpio=%d",
- max98373->reset_gpio);
+ /* this makes reset_gpio as invalid */
+ max98373->reset_gpio = -1;
}
if (!device_property_read_u32(dev, "maxim,spkfb-slot-no", &value))