In the quest to remove all stack VLA usage from the kernel[1], this moves the allocation into struct mdio_mux_gpio_state during probe.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qpxydaacu1rq...@mail.gmail.com Signed-off-by: Kees Cook <keesc...@chromium.org> --- v2: allocate array as part of structure (Andrew Lunn) --- drivers/net/phy/mdio-mux-gpio.c | 22 ++++++++++++++-------- 1 file changed, 14 insertions(+), 8 deletions(-) diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c index 082ffef0dec4..6b55e0ddef63 100644 --- a/drivers/net/phy/mdio-mux-gpio.c +++ b/drivers/net/phy/mdio-mux-gpio.c @@ -20,23 +20,23 @@ struct mdio_mux_gpio_state { struct gpio_descs *gpios; void *mux_handle; + int values[]; }; static int mdio_mux_gpio_switch_fn(int current_child, int desired_child, void *data) { struct mdio_mux_gpio_state *s = data; - int values[s->gpios->ndescs]; unsigned int n; if (current_child == desired_child) return 0; for (n = 0; n < s->gpios->ndescs; n++) - values[n] = (desired_child >> n) & 1; + s->values[n] = (desired_child >> n) & 1; gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc, - values); + s->values); return 0; } @@ -44,15 +44,21 @@ static int mdio_mux_gpio_switch_fn(int current_child, int desired_child, static int mdio_mux_gpio_probe(struct platform_device *pdev) { struct mdio_mux_gpio_state *s; + struct gpio_descs *gpios; int r; - s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL); - if (!s) + gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW); + if (IS_ERR(gpios)) + return PTR_ERR(gpios); + + s = devm_kzalloc(&pdev->dev, sizeof(*s->values) * gpios->ndescs + + sizeof(*s), GFP_KERNEL); + if (!s) { + gpiod_put_array(gpios); return -ENOMEM; + } - s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW); - if (IS_ERR(s->gpios)) - return PTR_ERR(s->gpios); + s->gpios = gpios; r = mdio_mux_init(&pdev->dev, pdev->dev.of_node, mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL); -- 2.17.0 -- Kees Cook Pixel Security
