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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org,
	stable@vger.kernel.org
Cc: Rand Deeb <rand.sec96@gmail.com>,
	Simon Horman <horms@kernel.org>,
	Tony Nguyen <anthony.l.nguyen@intel.com>,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.15 09/76] net: ice: Fix potential NULL pointer dereference in ice_bridge_setlink()
Date: Wed, 13 Mar 2024 12:41:16 -0400
Message-ID: <20240313164223.615640-10-sashal@kernel.org>
In-Reply-To: <20240313164223.615640-1-sashal@kernel.org>
References: <20240313164223.615640-1-sashal@kernel.org>
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From: Rand Deeb <rand.sec96@gmail.com>

[ Upstream commit 06e456a05d669ca30b224b8ed962421770c1496c ]

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.

Fixes: b1edc14a3fbf ("ice: Implement ice_bridge_getlink and ice_bridge_setlink")
Signed-off-by: Rand Deeb <rand.sec96@gmail.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 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 d4c29e2562a1c..3cc344d5228b6 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -6987,6 +6987,8 @@ 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;
-- 
2.43.0