In the quest to remove all stack VLA usage from the kernel[1], this allocates the values buffer during the callback instead of putting it on the stack.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qpxydaacu1rq...@mail.gmail.com Signed-off-by: Kees Cook <[email protected]> --- drivers/net/phy/mdio-mux-gpio.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c index 082ffef0dec4..e99994f4ed50 100644 --- a/drivers/net/phy/mdio-mux-gpio.c +++ b/drivers/net/phy/mdio-mux-gpio.c @@ -26,18 +26,23 @@ 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]; + int *values; unsigned int n; if (current_child == desired_child) return 0; + values = kmalloc_array(s->gpios->ndescs, sizeof(*values), GFP_KERNEL); + if (!values) + return -ENOMEM; + for (n = 0; n < s->gpios->ndescs; n++) values[n] = (desired_child >> n) & 1; gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc, values); + kfree(values); return 0; } -- 2.17.0 -- Kees Cook Pixel Security
