[PATCH 6.7 30/61] net: ice: Fix potential NULL pointer dereference in ice_bridge_setlink()

Sasha Levin
2024-03-13T16:33:15Z

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 adfdea1e2805a..a9cca2d24120a 100644
--- a/drivers/net/ethernet/intel/ice/ice_main.c
+++ b/drivers/net/ethernet/intel/ice/ice_main.c
@@ -7800,6 +7800,8 @@ 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