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authorRicardo Ribalda Delgado <ricardo.ribalda@gmail.com>2013-08-14 23:23:51 +0200
committerBryan Wu <cooloney@gmail.com>2013-08-27 02:22:14 +0200
commit8a6acd648c1dfdc82f1bbcd15f7777962054c268 (patch)
tree6fede8ad80ec6b4c0a33c5db6e77f45af5d8702d /drivers/leds
parentleds-pca9633: Rename to leds-pca963x (diff)
downloadlinux-8a6acd648c1dfdc82f1bbcd15f7777962054c268.tar.xz
linux-8a6acd648c1dfdc82f1bbcd15f7777962054c268.zip
leds-pca963x: Fix device tree parsing
A malformed device tree could lead into a segmentation fault if the reg value of a led is bigger than the number of leds. A valid device tree could have only information about the last led of the chip. Fix the device tree parsing to handle those cases. Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Signed-off-by: Bryan Wu <cooloney@gmail.com>
Diffstat (limited to 'drivers/leds')
-rw-r--r--drivers/leds/leds-pca963x.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/leds/leds-pca963x.c b/drivers/leds/leds-pca963x.c
index 35d56a62f92f..82589c0a5689 100644
--- a/drivers/leds/leds-pca963x.c
+++ b/drivers/leds/leds-pca963x.c
@@ -285,13 +285,13 @@ pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
u32 reg;
int res;
+ res = of_property_read_u32(child, "reg", &reg);
+ if ((res != 0) || (reg >= chip->n_leds))
+ continue;
led.name =
of_get_property(child, "label", NULL) ? : child->name;
led.default_trigger =
of_get_property(child, "linux,default-trigger", NULL);
- res = of_property_read_u32(child, "reg", &reg);
- if (res != 0)
- continue;
pca963x_leds[reg] = led;
}
pdata = devm_kzalloc(&client->dev,
@@ -300,7 +300,7 @@ pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
return ERR_PTR(-ENOMEM);
pdata->leds.leds = pca963x_leds;
- pdata->leds.num_leds = count;
+ pdata->leds.num_leds = chip->n_leds;
/* default to open-drain unless totem pole (push-pull) is specified */
if (of_property_read_bool(np, "nxp,totem-pole"))