[TCP]: Invoke tcp_sendmsg() directly, do not use inet_sendmsg(). As discovered by Evegniy Polyakov, if we try to sendmsg after a connection reset, we can do incredibly stupid things. The core issue is that inet_sendmsg() tries to autobind the socket, but we should never do that for TCP. Instead we should just go straight into TCP's sendmsg() code which will do all of the necessary state and pending socket error checks. TCP's sendpage already directly vectors to tcp_sendpage(), so this merely brings sendmsg() in line with that. Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- include/net/tcp.h | 2 +- net/ipv4/af_inet.c | 2 +- net/ipv4/tcp.c | 3 ++- net/ipv4/tcp_ipv4.c | 1 - net/ipv6/af_inet6.c | 2 +- net/ipv6/tcp_ipv6.c | 1 - 6 files changed, 5 insertions(+), 6 deletions(-) Index: 2.6/include/net/tcp.h =================================================================== --- 2.6.orig/include/net/tcp.h +++ 2.6/include/net/tcp.h @@ -273,7 +273,7 @@ extern int tcp_v4_remember_stamp(struc extern int tcp_v4_tw_remember_stamp(struct inet_timewait_sock *tw); -extern int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, +extern int tcp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size); extern ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags); Index: 2.6/net/ipv4/af_inet.c =================================================================== --- 2.6.orig/net/ipv4/af_inet.c +++ 2.6/net/ipv4/af_inet.c @@ -803,7 +803,7 @@ const struct proto_ops inet_stream_ops = .shutdown = inet_shutdown, .setsockopt = sock_common_setsockopt, .getsockopt = sock_common_getsockopt, - .sendmsg = inet_sendmsg, + .sendmsg = tcp_sendmsg, .recvmsg = sock_common_recvmsg, .mmap = sock_no_mmap, .sendpage = tcp_sendpage, Index: 2.6/net/ipv4/tcp.c =================================================================== --- 2.6.orig/net/ipv4/tcp.c +++ 2.6/net/ipv4/tcp.c @@ -658,9 +658,10 @@ static inline int select_size(struct soc return tmp; } -int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, +int tcp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, size_t size) { + struct sock *sk = sock->sk; struct iovec *iov; struct tcp_sock *tp = tcp_sk(sk); struct sk_buff *skb; Index: 2.6/net/ipv4/tcp_ipv4.c =================================================================== --- 2.6.orig/net/ipv4/tcp_ipv4.c +++ 2.6/net/ipv4/tcp_ipv4.c @@ -2427,7 +2427,6 @@ struct proto tcp_prot = { .shutdown = tcp_shutdown, .setsockopt = tcp_setsockopt, .getsockopt = tcp_getsockopt, - .sendmsg = tcp_sendmsg, .recvmsg = tcp_recvmsg, .backlog_rcv = tcp_v4_do_rcv, .hash = tcp_v4_hash, Index: 2.6/net/ipv6/af_inet6.c =================================================================== --- 2.6.orig/net/ipv6/af_inet6.c +++ 2.6/net/ipv6/af_inet6.c @@ -473,7 +473,7 @@ const struct proto_ops inet6_stream_ops .shutdown = inet_shutdown, /* ok */ .setsockopt = sock_common_setsockopt, /* ok */ .getsockopt = sock_common_getsockopt, /* ok */ - .sendmsg = inet_sendmsg, /* ok */ + .sendmsg = tcp_sendmsg, /* ok */ .recvmsg = sock_common_recvmsg, /* ok */ .mmap = sock_no_mmap, .sendpage = tcp_sendpage, Index: 2.6/net/ipv6/tcp_ipv6.c =================================================================== --- 2.6.orig/net/ipv6/tcp_ipv6.c +++ 2.6/net/ipv6/tcp_ipv6.c @@ -2127,7 +2127,6 @@ struct proto tcpv6_prot = { .shutdown = tcp_shutdown, .setsockopt = tcp_setsockopt, .getsockopt = tcp_getsockopt, - .sendmsg = tcp_sendmsg, .recvmsg = tcp_recvmsg, .backlog_rcv = tcp_v6_do_rcv, .hash = tcp_v6_hash, -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/