From: Natalia Petrova <n.petrova@xxxxxxxxxx> [ Upstream commit 7fa0b526f865cb42aa33917fd02a92cb03746f4d ] The result of nlmsg_find_attr() 'br_spec' is dereferenced in nla_for_each_nested(), but it can take NULL value in nla_find() function, which will result in an error. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 51616018dd1b ("i40e: Add support for getlink, setlink ndo ops") Signed-off-by: Natalia Petrova <n.petrova@xxxxxxxxxx> Reviewed-by: Jesse Brandeburg <jesse.brandeburg@xxxxxxxxx> Tested-by: Gurucharan G <gurucharanx.g@xxxxxxxxx> (A Contingent worker at Intel) Signed-off-by: Tony Nguyen <anthony.l.nguyen@xxxxxxxxx> Link: https://lore.kernel.org/r/20230209172833.3596034-1-anthony.l.nguyen@xxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/net/ethernet/intel/i40e/i40e_main.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 4a32f84dc0571..5ffcd3cc989f7 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -13005,6 +13005,8 @@ static int i40e_ndo_bridge_setlink(struct net_device *dev, } 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; -- 2.39.0