From: Xie He Date: Tue, 20 Oct 2020 01:31:52 +0000 (-0700) Subject: net: hdlc: In hdlc_rcv, check to make sure dev is an HDLC device X-Git-Tag: v4.9.241~134 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=03c795ae6ac2297ac04d3f1d90015900f2c9b5c2;p=platform%2Fkernel%2Flinux-amlogic.git net: hdlc: In hdlc_rcv, check to make sure dev is an HDLC device [ Upstream commit 01c4ceae0a38a0bdbfea6896f41efcd985a9c064 ] The hdlc_rcv function is used as hdlc_packet_type.func to process any skb received in the kernel with skb->protocol == htons(ETH_P_HDLC). The purpose of this function is to provide second-stage processing for skbs not assigned a "real" L3 skb->protocol value in the first stage. This function assumes the device from which the skb is received is an HDLC device (a device created by this module). It assumes that netdev_priv(dev) returns a pointer to "struct hdlc_device". However, it is possible that some driver in the kernel (not necessarily in our control) submits a received skb with skb->protocol == htons(ETH_P_HDLC), from a non-HDLC device. In this case, the skb would still be received by hdlc_rcv. This will cause problems. hdlc_rcv should be able to recognize and drop invalid skbs. It should first make sure "dev" is actually an HDLC device, before starting its processing. This patch adds this check to hdlc_rcv. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: Krzysztof Halasa Signed-off-by: Xie He Link: https://lore.kernel.org/r/20201020013152.89259-1-xie.he.0141@gmail.com Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/net/wan/hdlc.c b/drivers/net/wan/hdlc.c index 9bd4aa8083ce..6061bff85523 100644 --- a/drivers/net/wan/hdlc.c +++ b/drivers/net/wan/hdlc.c @@ -57,7 +57,15 @@ int hdlc_change_mtu(struct net_device *dev, int new_mtu) static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *p, struct net_device *orig_dev) { - struct hdlc_device *hdlc = dev_to_hdlc(dev); + struct hdlc_device *hdlc; + + /* First make sure "dev" is an HDLC device */ + if (!(dev->priv_flags & IFF_WAN_HDLC)) { + kfree_skb(skb); + return NET_RX_SUCCESS; + } + + hdlc = dev_to_hdlc(dev); if (!net_eq(dev_net(dev), &init_net)) { kfree_skb(skb);