From 65c95f78917ea6fa7ff189a2c19879c4fe161873 Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Mon, 11 Dec 2023 09:37:58 +0100 Subject: [PATCH] dpll: sanitize possible null pointer dereference in dpll_pin_parent_pin_set() User may not pass DPLL_A_PIN_STATE attribute in the pin set operation message. Sanitize that by checking if the attr pointer is not null and process the passed state attribute value only in that case. Reported-by: Xingyuan Mo Fixes: 9d71b54b65b1 ("dpll: netlink: Add DPLL framework base functions") Signed-off-by: Jiri Pirko Acked-by: Vadim Fedorenko Link: https://lore.kernel.org/r/20231211083758.1082853-1-jiri@resnulli.us Signed-off-by: Jakub Kicinski --- drivers/dpll/dpll_netlink.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index 442a0ebeb953..ce7cf736f020 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -925,7 +925,6 @@ dpll_pin_parent_pin_set(struct dpll_pin *pin, struct nlattr *parent_nest, struct netlink_ext_ack *extack) { struct nlattr *tb[DPLL_A_PIN_MAX + 1]; - enum dpll_pin_state state; u32 ppin_idx; int ret; @@ -936,10 +935,14 @@ dpll_pin_parent_pin_set(struct dpll_pin *pin, struct nlattr *parent_nest, return -EINVAL; } ppin_idx = nla_get_u32(tb[DPLL_A_PIN_PARENT_ID]); - state = nla_get_u32(tb[DPLL_A_PIN_STATE]); - ret = dpll_pin_on_pin_state_set(pin, ppin_idx, state, extack); - if (ret) - return ret; + + if (tb[DPLL_A_PIN_STATE]) { + enum dpll_pin_state state = nla_get_u32(tb[DPLL_A_PIN_STATE]); + + ret = dpll_pin_on_pin_state_set(pin, ppin_idx, state, extack); + if (ret) + return ret; + } return 0; } -- 2.39.5