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net: phy: fixed_phy: fix use-after-free when checking link GPIO

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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 <davem@davemloft.net>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Torokhov 2020-01-02 17:03:19 -08:00 committed by David S. Miller
parent b605c9abc4
commit d266f19f3a
1 changed files with 2 additions and 5 deletions
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7
drivers/net/phy/fixed_phy.c
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@ -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;
}