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Date:	Tue, 15 Apr 2014 14:32:32 +0800
From:	Zhan Jianyu <nasa4836@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	James Chapman <jchapman@...alix.com>,
	Eric Dumazet <edumazet@...gle.com>, joe@...ches.com,
	LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: [BUG] A panic caused by null pointer dereference aftering
 updating to

On Tue, Apr 15, 2014 at 8:14 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> Zhan, could you try following patch, thanks !
>
>  drivers/net/vxlan.c                 |    4 ++--
>  include/net/dst.h                   |   14 +++++++++++---
>  include/net/inet6_connection_sock.h |    2 +-
>  include/net/inet_connection_sock.h  |    2 +-
>  include/net/ip.h                    |   13 +++++++++----
>  include/net/ip_tunnels.h            |    2 +-
>  net/core/dst.c                      |    4 ++--
>  net/dccp/output.c                   |    2 +-
>  net/ipv4/ip_output.c                |   16 ++++++++--------
>  net/ipv4/ip_tunnel.c                |    2 +-
>  net/ipv4/ip_tunnel_core.c           |    4 ++--
>  net/ipv4/route.c                    |    4 ++--
>  net/ipv4/tcp_output.c               |    2 +-
>  net/ipv6/inet6_connection_sock.c    |    3 +--
>  net/ipv6/sit.c                      |    5 +++--
>  net/l2tp/l2tp_core.c                |    4 ++--
>  net/l2tp/l2tp_ip.c                  |    2 +-
>  net/openvswitch/vport-gre.c         |    2 +-
>  net/sctp/protocol.c                 |    2 +-
>  19 files changed, 51 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index c55e316373a1..82355d5d155a 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -1755,8 +1755,8 @@ int vxlan_xmit_skb(struct vxlan_sock *vs,
>         if (err)
>                 return err;
>
> -       return iptunnel_xmit(rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df,
> -                            false);
> +       return iptunnel_xmit(vs->sock->sk, rt, skb, src, dst, IPPROTO_UDP,
> +                            tos, ttl, df, false);
>  }
>  EXPORT_SYMBOL_GPL(vxlan_xmit_skb);
>
> diff --git a/include/net/dst.h b/include/net/dst.h
> index 46ed958e0c6e..71c60f42be48 100644
> --- a/include/net/dst.h
> +++ b/include/net/dst.h
> @@ -45,7 +45,7 @@ struct dst_entry {
>         void                    *__pad1;
>  #endif
>         int                     (*input)(struct sk_buff *);
> -       int                     (*output)(struct sk_buff *);
> +       int                     (*output)(struct sock *sk, struct sk_buff *skb);
>
>         unsigned short          flags;
>  #define DST_HOST               0x0001
> @@ -367,7 +367,11 @@ static inline struct dst_entry *skb_dst_pop(struct sk_buff *skb)
>         return child;
>  }
>
> -int dst_discard(struct sk_buff *skb);
> +int dst_discard_sk(struct sock *sk, struct sk_buff *skb);
> +static inline int dst_discard(struct sk_buff *skb)
> +{
> +       return dst_discard_sk(skb->sk, skb);
> +}
>  void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref,
>                 int initial_obsolete, unsigned short flags);
>  void __dst_free(struct dst_entry *dst);
> @@ -449,9 +453,13 @@ static inline void dst_set_expires(struct dst_entry *dst, int timeout)
>  }
>
>  /* Output packet to network from transport.  */
> +static inline int dst_output_sk(struct sock *sk, struct sk_buff *skb)
> +{
> +       return skb_dst(skb)->output(sk, skb);
> +}
>  static inline int dst_output(struct sk_buff *skb)
>  {
> -       return skb_dst(skb)->output(skb);
> +       return dst_output_sk(skb->sk, skb);
>  }
>
>  /* Input packet from network to transport.  */
> diff --git a/include/net/inet6_connection_sock.h b/include/net/inet6_connection_sock.h
> index f981ba7adeed..74af137304be 100644
> --- a/include/net/inet6_connection_sock.h
> +++ b/include/net/inet6_connection_sock.h
> @@ -40,7 +40,7 @@ void inet6_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
>
>  void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
>
> -int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl);
> +int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
>
>  struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu);
>  #endif /* _INET6_CONNECTION_SOCK_H */
> diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
> index c55aeed41ace..7a4313887568 100644
> --- a/include/net/inet_connection_sock.h
> +++ b/include/net/inet_connection_sock.h
> @@ -36,7 +36,7 @@ struct tcp_congestion_ops;
>   * (i.e. things that depend on the address family)
>   */
>  struct inet_connection_sock_af_ops {
> -       int         (*queue_xmit)(struct sk_buff *skb, struct flowi *fl);
> +       int         (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
>         void        (*send_check)(struct sock *sk, struct sk_buff *skb);
>         int         (*rebuild_header)(struct sock *sk);
>         void        (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
> diff --git a/include/net/ip.h b/include/net/ip.h
> index 25064c28e059..3ec2b0fb9d83 100644
> --- a/include/net/ip.h
> +++ b/include/net/ip.h
> @@ -104,14 +104,19 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
>            struct net_device *orig_dev);
>  int ip_local_deliver(struct sk_buff *skb);
>  int ip_mr_input(struct sk_buff *skb);
> -int ip_output(struct sk_buff *skb);
> -int ip_mc_output(struct sk_buff *skb);
> +int ip_output(struct sock *sk, struct sk_buff *skb);
> +int ip_mc_output(struct sock *sk, struct sk_buff *skb);
>  int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
>  int ip_do_nat(struct sk_buff *skb);
>  void ip_send_check(struct iphdr *ip);
>  int __ip_local_out(struct sk_buff *skb);
> -int ip_local_out(struct sk_buff *skb);
> -int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
> +int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
> +static inline int ip_local_out(struct sk_buff *skb)
> +{
> +       return ip_local_out_sk(skb->sk, skb);
> +}
> +
> +int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
>  void ip_init(void);
>  int ip_append_data(struct sock *sk, struct flowi4 *fl4,
>                    int getfrag(void *from, char *to, int offset, int len,
> diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
> index e77c10405d51..a4daf9eb8562 100644
> --- a/include/net/ip_tunnels.h
> +++ b/include/net/ip_tunnels.h
> @@ -153,7 +153,7 @@ static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
>  }
>
>  int iptunnel_pull_header(struct sk_buff *skb, int hdr_len, __be16 inner_proto);
> -int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb,
> +int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
>                   __be32 src, __be32 dst, __u8 proto,
>                   __u8 tos, __u8 ttl, __be16 df, bool xnet);
>
> diff --git a/net/core/dst.c b/net/core/dst.c
> index ca4231ec7347..7443c2725c9c 100644
> --- a/net/core/dst.c
> +++ b/net/core/dst.c
> @@ -142,12 +142,12 @@ loop:
>         mutex_unlock(&dst_gc_mutex);
>  }
>
> -int dst_discard(struct sk_buff *skb)
> +int dst_discard_sk(struct sock *sk, struct sk_buff *skb)
>  {
>         kfree_skb(skb);
>         return 0;
>  }
> -EXPORT_SYMBOL(dst_discard);
> +EXPORT_SYMBOL(dst_discard_sk);
>
>  const u32 dst_default_metrics[RTAX_MAX + 1] = {
>         /* This initializer is needed to force linker to place this variable
> diff --git a/net/dccp/output.c b/net/dccp/output.c
> index 8876078859da..0248e8a3460c 100644
> --- a/net/dccp/output.c
> +++ b/net/dccp/output.c
> @@ -138,7 +138,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
>
>                 DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
>
> -               err = icsk->icsk_af_ops->queue_xmit(skb, &inet->cork.fl);
> +               err = icsk->icsk_af_ops->queue_xmit(sk, skb, &inet->cork.fl);
>                 return net_xmit_eval(err);
>         }
>         return -ENOBUFS;
> diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
> index 1a0755fea491..1cbeba5edff9 100644
> --- a/net/ipv4/ip_output.c
> +++ b/net/ipv4/ip_output.c
> @@ -101,17 +101,17 @@ int __ip_local_out(struct sk_buff *skb)
>                        skb_dst(skb)->dev, dst_output);
>  }
>
> -int ip_local_out(struct sk_buff *skb)
> +int ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
>  {
>         int err;
>
>         err = __ip_local_out(skb);
>         if (likely(err == 1))
> -               err = dst_output(skb);
> +               err = dst_output_sk(sk, skb);
>
>         return err;
>  }
> -EXPORT_SYMBOL_GPL(ip_local_out);
> +EXPORT_SYMBOL_GPL(ip_local_out_sk);
>
>  static inline int ip_select_ttl(struct inet_sock *inet, struct dst_entry *dst)
>  {
> @@ -226,9 +226,8 @@ static int ip_finish_output(struct sk_buff *skb)
>                 return ip_finish_output2(skb);
>  }
>
> -int ip_mc_output(struct sk_buff *skb)
> +int ip_mc_output(struct sock *sk, struct sk_buff *skb)
>  {
> -       struct sock *sk = skb->sk;
>         struct rtable *rt = skb_rtable(skb);
>         struct net_device *dev = rt->dst.dev;
>
> @@ -287,7 +286,7 @@ int ip_mc_output(struct sk_buff *skb)
>                             !(IPCB(skb)->flags & IPSKB_REROUTED));
>  }
>
> -int ip_output(struct sk_buff *skb)
> +int ip_output(struct sock *sk, struct sk_buff *skb)
>  {
>         struct net_device *dev = skb_dst(skb)->dev;
>
> @@ -315,9 +314,9 @@ static void ip_copy_addrs(struct iphdr *iph, const struct flowi4 *fl4)
>                sizeof(fl4->saddr) + sizeof(fl4->daddr));
>  }
>
> -int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl)
> +/* Note: skb->sk can be different from sk, in case of tunnels */
> +int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
>  {
> -       struct sock *sk = skb->sk;
>         struct inet_sock *inet = inet_sk(sk);
>         struct ip_options_rcu *inet_opt;
>         struct flowi4 *fl4;
> @@ -389,6 +388,7 @@ packet_routed:
>         ip_select_ident_more(skb, &rt->dst, sk,
>                              (skb_shinfo(skb)->gso_segs ?: 1) - 1);
>
> +       /* TODO : should we use skb->sk here instead of sk ? */
>         skb->priority = sk->sk_priority;
>         skb->mark = sk->sk_mark;
>
> diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
> index e77381d1df9a..484d0ce27ef7 100644
> --- a/net/ipv4/ip_tunnel.c
> +++ b/net/ipv4/ip_tunnel.c
> @@ -670,7 +670,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
>                 return;
>         }
>
> -       err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, protocol,
> +       err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr, protocol,
>                             tos, ttl, df, !net_eq(tunnel->net, dev_net(dev)));
>         iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
>
> diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
> index e0c2b1d2ea4e..bcf206c79005 100644
> --- a/net/ipv4/ip_tunnel_core.c
> +++ b/net/ipv4/ip_tunnel_core.c
> @@ -46,7 +46,7 @@
>  #include <net/netns/generic.h>
>  #include <net/rtnetlink.h>
>
> -int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb,
> +int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
>                   __be32 src, __be32 dst, __u8 proto,
>                   __u8 tos, __u8 ttl, __be16 df, bool xnet)
>  {
> @@ -76,7 +76,7 @@ int iptunnel_xmit(struct rtable *rt, struct sk_buff *skb,
>         iph->ttl        =       ttl;
>         __ip_select_ident(iph, &rt->dst, (skb_shinfo(skb)->gso_segs ?: 1) - 1);
>
> -       err = ip_local_out(skb);
> +       err = ip_local_out_sk(sk, skb);
>         if (unlikely(net_xmit_eval(err)))
>                 pkt_len = 0;
>         return pkt_len;
> diff --git a/net/ipv4/route.c b/net/ipv4/route.c
> index 34d094cadb11..f2279d4470c4 100644
> --- a/net/ipv4/route.c
> +++ b/net/ipv4/route.c
> @@ -1129,7 +1129,7 @@ static void ipv4_link_failure(struct sk_buff *skb)
>                 dst_set_expires(&rt->dst, 0);
>  }
>
> -static int ip_rt_bug(struct sk_buff *skb)
> +static int ip_rt_bug(struct sock *sk, struct sk_buff *skb)
>  {
>         pr_debug("%s: %pI4 -> %pI4, %s\n",
>                  __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
> @@ -2218,7 +2218,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
>
>                 new->__use = 1;
>                 new->input = dst_discard;
> -               new->output = dst_discard;
> +               new->output = dst_discard_sk;
>
>                 new->dev = ort->dst.dev;
>                 if (new->dev)
> diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
> index 699fb102e971..025e25093984 100644
> --- a/net/ipv4/tcp_output.c
> +++ b/net/ipv4/tcp_output.c
> @@ -981,7 +981,7 @@ static int tcp_transmit_skb(struct sock *sk, struct sk_buff *skb, int clone_it,
>                 TCP_ADD_STATS(sock_net(sk), TCP_MIB_OUTSEGS,
>                               tcp_skb_pcount(skb));
>
> -       err = icsk->icsk_af_ops->queue_xmit(skb, &inet->cork.fl);
> +       err = icsk->icsk_af_ops->queue_xmit(sk, skb, &inet->cork.fl);
>         if (likely(err <= 0))
>                 return err;
>
> diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
> index c9138189415a..d4ade34ab375 100644
> --- a/net/ipv6/inet6_connection_sock.c
> +++ b/net/ipv6/inet6_connection_sock.c
> @@ -224,9 +224,8 @@ static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
>         return dst;
>  }
>
> -int inet6_csk_xmit(struct sk_buff *skb, struct flowi *fl_unused)
> +int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
>  {
> -       struct sock *sk = skb->sk;
>         struct ipv6_pinfo *np = inet6_sk(sk);
>         struct flowi6 fl6;
>         struct dst_entry *dst;
> diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
> index 1693c8d885f0..8da8268d65f8 100644
> --- a/net/ipv6/sit.c
> +++ b/net/ipv6/sit.c
> @@ -974,8 +974,9 @@ static netdev_tx_t ipip6_tunnel_xmit(struct sk_buff *skb,
>                 goto out;
>         }
>
> -       err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, IPPROTO_IPV6, tos,
> -                           ttl, df, !net_eq(tunnel->net, dev_net(dev)));
> +       err = iptunnel_xmit(skb->sk, rt, skb, fl4.saddr, fl4.daddr,
> +                           IPPROTO_IPV6, tos, ttl, df,
> +                           !net_eq(tunnel->net, dev_net(dev)));
>         iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
>         return NETDEV_TX_OK;
>
> diff --git a/net/l2tp/l2tp_core.c b/net/l2tp/l2tp_core.c
> index 47f7a5490555..a4e37d7158dc 100644
> --- a/net/l2tp/l2tp_core.c
> +++ b/net/l2tp/l2tp_core.c
> @@ -1131,10 +1131,10 @@ static int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb,
>         skb->local_df = 1;
>  #if IS_ENABLED(CONFIG_IPV6)
>         if (tunnel->sock->sk_family == PF_INET6 && !tunnel->v4mapped)
> -               error = inet6_csk_xmit(skb, NULL);
> +               error = inet6_csk_xmit(tunnel->sock, skb, NULL);
>         else
>  #endif
> -               error = ip_queue_xmit(skb, fl);
> +               error = ip_queue_xmit(tunnel->sock, skb, fl);
>
>         /* Update stats */
>         if (error >= 0) {
> diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
> index 0b44d855269c..3397fe6897c0 100644
> --- a/net/l2tp/l2tp_ip.c
> +++ b/net/l2tp/l2tp_ip.c
> @@ -487,7 +487,7 @@ static int l2tp_ip_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *m
>
>  xmit:
>         /* Queue the packet to IP for output */
> -       rc = ip_queue_xmit(skb, &inet->cork.fl);
> +       rc = ip_queue_xmit(sk, skb, &inet->cork.fl);
>         rcu_read_unlock();
>
>  error:
> diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
> index a3d6951602db..ebb6e2442554 100644
> --- a/net/openvswitch/vport-gre.c
> +++ b/net/openvswitch/vport-gre.c
> @@ -174,7 +174,7 @@ static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
>
>         skb->local_df = 1;
>
> -       return iptunnel_xmit(rt, skb, fl.saddr,
> +       return iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
>                              OVS_CB(skb)->tun_key->ipv4_dst, IPPROTO_GRE,
>                              OVS_CB(skb)->tun_key->ipv4_tos,
>                              OVS_CB(skb)->tun_key->ipv4_ttl, df, false);

Hi, Eric,

I've applied the patch, it seems now works for me, at least no panic any more:-)
Thanks for all you guys.

Tested-by: Jianyu Zhan <nasa4836@...il.com>


Regards,
Jianyu Zhan
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