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pinctrl: tb10x: Use flexible-array member and struct_size() helper 

Update the code to use a flexible array member instead of a pointer in
structure tb10x_pinctrl and use the struct_size() helper:

struct tb10x_pinctrl {
        ...
	struct tb10x_of_pinfunc pinfuncs[];
};

Also, make use of the struct_size() helper instead of an open-coded
version in order to avoid any potential type mistakes.

So, replace the following form:

sizeof(struct tb10x_pinctrl) + of_get_child_count(of_node) * sizeof(struct tb10x_of_pinfunc)

with:

struct_size(state, pinfuncs, of_get_child_count(of_node))

This code was detected with the help of Coccinelle.

Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Gustavo A. R. Silva 2019-06-06 18:11:44 -05:00 committed by Linus Walleij
parent 76c4c597b2
commit d32aa74555
1 changed files with 5 additions and 7 deletions
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12
drivers/pinctrl/pinctrl-tb10x.c
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@ -483,22 +483,22 @@ struct tb10x_port {
* @base: register set base address.
* @pingroups: pointer to an array of the pin groups this driver manages.
* @pinfuncgrpcnt: number of pingroups in @pingroups.
* @pinfuncs: pointer to an array of pin functions this driver manages.
* @pinfuncnt: number of pin functions in @pinfuncs.
* @mutex: mutex for exclusive access to a pin controller's state.
* @ports: current state of each port.
* @gpios: Indicates if a given pin is currently used as GPIO (1) or not (0).
* @pinfuncs: flexible array of pin functions this driver manages.
*/
struct tb10x_pinctrl {
struct pinctrl_dev *pctl;
void *base;
const struct tb10x_pinfuncgrp *pingroups;
unsigned int pinfuncgrpcnt;
struct tb10x_of_pinfunc *pinfuncs;
unsigned int pinfuncnt;
struct mutex mutex;
struct tb10x_port ports[TB10X_PORTS];
DECLARE_BITMAP(gpios, MAX_PIN + 1);
struct tb10x_of_pinfunc pinfuncs[];
};
static inline void tb10x_pinctrl_set_config(struct tb10x_pinctrl *state,
@ -771,15 +771,13 @@ static int tb10x_pinctrl_probe(struct platform_device *pdev)
return -EINVAL;
}
state = devm_kzalloc(dev, sizeof(struct tb10x_pinctrl) +
of_get_child_count(of_node)
* sizeof(struct tb10x_of_pinfunc),
GFP_KERNEL);
state = devm_kzalloc(dev, struct_size(state, pinfuncs,
of_get_child_count(of_node)),
GFP_KERNEL);
if (!state)
return -ENOMEM;
platform_set_drvdata(pdev, state);
state->pinfuncs = (struct tb10x_of_pinfunc *)(state + 1);
mutex_init(&state->mutex);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);