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leds: lm3697: Fix out-of-bound access 

If both LED banks aren't used in device tree, an out-of-bounds
condition in lm3697_init occurs because of the for loop assuming that
all the banks are used.  Fix it by adding a variable that contains the
number of used banks.

Signed-off-by: Gabriel David <ultracoolguy@tutanota.com>
[removed extra rename, minor tweaks]
Signed-off-by: Pavel Machek <pavel@ucw.cz>
Cc: stable@kernel.org
This commit is contained in:
Gabriel David 2020-10-02 18:27:00 -04:00 committed by Pavel Machek
parent 8fd8f94235
commit 98d278ca00
1 changed files with 5 additions and 3 deletions
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8
drivers/leds/leds-lm3697.c
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@ -78,6 +78,7 @@ struct lm3697 {
struct mutex lock;
int bank_cfg;
int num_banks;
struct lm3697_led leds[];
};
@ -180,7 +181,7 @@ static int lm3697_init(struct lm3697 *priv)
if (ret)
dev_err(dev, "Cannot write OUTPUT config\n");
for (i = 0; i < LM3697_MAX_CONTROL_BANKS; i++) {
for (i = 0; i < priv->num_banks; i++) {
led = &priv->leds[i];
ret = ti_lmu_common_set_ramp(&led->lmu_data);
if (ret)
@ -301,8 +302,8 @@ static int lm3697_probe(struct i2c_client *client,
int ret;
count = device_get_child_node_count(dev);
if (!count) {
dev_err(dev, "LEDs are not defined in device tree!");
if (!count || count > LM3697_MAX_CONTROL_BANKS) {
dev_err(dev, "Strange device tree!");
return -ENODEV;
}
@ -315,6 +316,7 @@ static int lm3697_probe(struct i2c_client *client,
led->client = client;
led->dev = dev;
led->num_banks = count;
led->regmap = devm_regmap_init_i2c(client, &lm3697_regmap_config);
if (IS_ERR(led->regmap)) {
ret = PTR_ERR(led->regmap);