From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kees Cook Subject: [PATCH] mdio-mux-gpio: Remove VLA usage Date: Tue, 29 May 2018 15:59:01 -0700 Message-ID: <20180529225901.GA30464@beast> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org To: Linus Walleij Cc: Pramod Kumar , Andrew Lunn , Florian Fainelli , "David S. Miller" , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-gpio@vger.kernel.org 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=qPXydAacU1RqZWA@mail.gmail.com Signed-off-by: Kees Cook --- 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