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Miller" , "Eric Dumazet" , Jakub Kicinski , Paolo Abeni , , , , Subject: [PATCH] i40e: Add checking for null for nlmsg_find_attr() Date: Wed, 25 Jan 2023 17:13:28 +0300 Message-ID: <20230125141328.8479-1-n.petrova@fintech.ru> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.0.253.125] X-ClientProxiedBy: Ex16-01.fintech.ru (10.0.10.18) To Ex16-01.fintech.ru (10.0.10.18) X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756004688747310918?= X-GMAIL-MSGID: =?utf-8?q?1756004688747310918?= The result of nlmsg_find_attr() 'br_spec' is dereferenced in nla_for_each_nested, but it can take null value in 'nla_find' finction, 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 --- 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 b36bf9c3e1e4..ed4be4ffeb09 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -13101,6 +13101,8 @@ 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 -ENOENT; nla_for_each_nested(attr, br_spec, rem) { __u16 mode;