6.11-stable review patch. If anyone has any objections, please let me know.
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From: Kees Cook kees@kernel.org
[ Upstream commit 045391a02bd971d431c83ad03f7cc51b6e2fe331 ]
With the new __counted_by annotation, the "num_leds" variable needs to valid for accesses to the "leds" array. This requirement is not met in gpio_leds_create(), since "num_leds" starts at "0", so "leds" index "0" will not be considered valid (num_leds would need to be "1" to access index "0").
Fix this by setting the allocation size after allocation, and then update the final count based on how many were actually added to the array.
Fixes: 52cd75108a42 ("leds: gpio: Annotate struct gpio_leds_priv with __counted_by") Signed-off-by: Kees Cook kees@kernel.org Reviewed-by: Gustavo A. R. Silva gustavoars@kernel.org Link: https://lore.kernel.org/r/20240716212455.work.809-kees@kernel.org Signed-off-by: Lee Jones lee@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/leds/leds-gpio.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c index 83fcd7b6afff7..4d1612d557c84 100644 --- a/drivers/leds/leds-gpio.c +++ b/drivers/leds/leds-gpio.c @@ -150,7 +150,7 @@ static struct gpio_leds_priv *gpio_leds_create(struct device *dev) { struct fwnode_handle *child; struct gpio_leds_priv *priv; - int count, ret; + int count, used, ret;
count = device_get_child_node_count(dev); if (!count) @@ -159,9 +159,11 @@ static struct gpio_leds_priv *gpio_leds_create(struct device *dev) priv = devm_kzalloc(dev, struct_size(priv, leds, count), GFP_KERNEL); if (!priv) return ERR_PTR(-ENOMEM); + priv->num_leds = count; + used = 0;
device_for_each_child_node(dev, child) { - struct gpio_led_data *led_dat = &priv->leds[priv->num_leds]; + struct gpio_led_data *led_dat = &priv->leds[used]; struct gpio_led led = {};
/* @@ -197,8 +199,9 @@ static struct gpio_leds_priv *gpio_leds_create(struct device *dev) /* Set gpiod label to match the corresponding LED name. */ gpiod_set_consumer_name(led_dat->gpiod, led_dat->cdev.dev->kobj.name); - priv->num_leds++; + used++; } + priv->num_leds = used;
return priv; }