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| author | Gabriel David <ultracoolguy@tutanota.com> | 2020-10-02 18:27:00 -0400 |
|---|---|---|
| committer | Pavel Machek <pavel@ucw.cz> | 2020-10-05 20:36:09 +0200 |
| commit | 98d278ca00bd8f62c8bc98bd9e65372d16eb6956 (patch) | |
| tree | e4928fce367f64d4143689b2a10190b331a14022 /drivers/leds/leds-lm3697.c | |
| parent | 8fd8f94235c2c925d80b2316e0ab2bdd00af9bae (diff) | |
| download | lwn-98d278ca00bd8f62c8bc98bd9e65372d16eb6956.tar.gz lwn-98d278ca00bd8f62c8bc98bd9e65372d16eb6956.zip | |
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
Diffstat (limited to 'drivers/leds/leds-lm3697.c')
| -rw-r--r-- | drivers/leds/leds-lm3697.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/leds/leds-lm3697.c b/drivers/leds/leds-lm3697.c index 64c0794801e6..7d216cdb91a8 100644 --- a/drivers/leds/leds-lm3697.c +++ b/drivers/leds/leds-lm3697.c @@ -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); |