linux-kernel - [PATCH] net: ice: Fix potential NULL pointer dereference in ice_bridge

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Message-Id: <20240228155448.121603-1-rand.sec96@gmail.com>
Date: Wed, 28 Feb 2024 18:54:48 +0300
From: Rand Deeb <rand.sec96@...il.com>
To: Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	"David S . Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: deeb.rand@...fident.ru,
	lvc-project@...uxtesting.org,
	voskresenski.stanislav@...fident.ru,
	Rand Deeb <rand.sec96@...il.com>
Subject: [PATCH] net: ice: Fix potential NULL pointer dereference in ice_bridge_setlink()

The function ice_bridge_setlink() may encounter a NULL pointer dereference
if nlmsg_find_attr() returns NULL and br_spec is dereferenced subsequently
in nla_for_each_nested(). To address this issue, add a check to ensure that
br_spec is not NULL before proceeding with the nested attribute iteration.

Signed-off-by: Rand Deeb <rand.sec96@...il.com>
---
 drivers/net/ethernet/intel/ice/ice_main.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_main.c b/drivers/net/ethernet/intel/ice/ice_main.c
index 4f0d63fa5709..ba2bbd53d543 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -6530,6 +6530,8 @@ ice_bridge_setlink(struct net_device *dev, struct nlmsghdr *nlh,
 	pf_sw = pf->first_sw;
 	/* find the attribute in the netlink message */
 	br_spec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC);
+	if (!br_spec)
+		return -EINVAL;
 
 	nla_for_each_nested(attr, br_spec, rem) {
 		__u16 mode;
-- 
2.34.1