From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin King Subject: [PATCH] net: qualcomm: rmnet: check for null ep to avoid null pointer dereference Date: Fri, 23 Mar 2018 23:51:57 +0000 Message-ID: <20180323235157.8129-1-colin.king@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org To: "David S . Miller" , Subash Abhinov Kasiviswanathan , netdev@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org From: Colin Ian King The call to rmnet_get_endpoint can potentially return NULL so check for this to avoid any subsequent null pointer dereferences on a NULL ep. Detected by CoverityScan, CID#1465385 ("Dereference null return value") Fixes: 23790ef12082 ("net: qualcomm: rmnet: Allow to configure flags for existing devices") Signed-off-by: Colin Ian King --- drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c index 38d9356ebcc4..d33988570217 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_config.c @@ -312,6 +312,8 @@ static int rmnet_changelink(struct net_device *dev, struct nlattr *tb[], if (data[IFLA_RMNET_MUX_ID]) { mux_id = nla_get_u16(data[IFLA_RMNET_MUX_ID]); ep = rmnet_get_endpoint(port, priv->mux_id); + if (!ep) + return -ENODEV; hlist_del_init_rcu(&ep->hlnode); hlist_add_head_rcu(&ep->hlnode, &port->muxed_ep[mux_id]); -- 2.15.1