From: Dmitry Torokhov Date: Fri, 3 Jan 2020 01:03:19 +0000 (-0800) Subject: net: phy: fixed_phy: fix use-after-free when checking link GPIO X-Git-Tag: v5.15~4637^2~162^2~1 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=d266f19f3ae7fbcaf92229639b78d2110ae44f33;p=mirror_ubuntu-kernels.git net: phy: fixed_phy: fix use-after-free when checking link GPIO If we fail to locate GPIO for any reason other than deferral or not-found-GPIO, we try to print device tree node info, however if might be freed already as we called of_node_put() on it. Acked-by: David S. Miller Signed-off-by: Dmitry Torokhov Signed-off-by: David S. Miller --- diff --git a/drivers/net/phy/fixed_phy.c b/drivers/net/phy/fixed_phy.c index 7c5265fd2b94..4190f9ed5313 100644 --- a/drivers/net/phy/fixed_phy.c +++ b/drivers/net/phy/fixed_phy.c @@ -212,16 +212,13 @@ static struct gpio_desc *fixed_phy_get_gpiod(struct device_node *np) */ gpiod = gpiod_get_from_of_node(fixed_link_node, "link-gpios", 0, GPIOD_IN, "mdio"); - of_node_put(fixed_link_node); - if (IS_ERR(gpiod)) { - if (PTR_ERR(gpiod) == -EPROBE_DEFER) - return gpiod; - + if (IS_ERR(gpiod) && PTR_ERR(gpiod) != -EPROBE_DEFER) { if (PTR_ERR(gpiod) != -ENOENT) pr_err("error getting GPIO for fixed link %pOF, proceed without\n", fixed_link_node); gpiod = NULL; } + of_node_put(fixed_link_node); return gpiod; }