[PATCH 4.4 06/66] tcp: initialize rcv_mss to TCP_MIN_MSS instead of 0
4.4-stable review patch. If anyone has any objections, please let me know. -- From: Wei Wang[ Upstream commit 499350a5a6e7512d9ed369ed63a4244b6536f4f8 ] When tcp_disconnect() is called, inet_csk_delack_init() sets icsk->icsk_ack.rcv_mss to 0. This could potentially cause tcp_recvmsg() => tcp_cleanup_rbuf() => __tcp_select_window() call path to have division by 0 issue. So this patch initializes rcv_mss to TCP_MIN_MSS instead of 0. Reported-by: Andrey Konovalov Signed-off-by: Wei Wang Signed-off-by: Eric Dumazet Signed-off-by: Neal Cardwell Signed-off-by: Yuchung Cheng Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/tcp.c |4 1 file changed, 4 insertions(+) --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2260,6 +2260,10 @@ int tcp_disconnect(struct sock *sk, int tcp_set_ca_state(sk, TCP_CA_Open); tcp_clear_retrans(tp); inet_csk_delack_init(sk); + /* Initialize rcv_mss to TCP_MIN_MSS to avoid division by 0 +* issue in __tcp_select_window() +*/ + icsk->icsk_ack.rcv_mss = TCP_MIN_MSS; tcp_init_send_head(sk); memset(>rx_opt, 0, sizeof(tp->rx_opt)); __sk_dst_reset(sk);
[PATCH 4.4 06/66] tcp: initialize rcv_mss to TCP_MIN_MSS instead of 0
4.4-stable review patch. If anyone has any objections, please let me know. -- From: Wei Wang [ Upstream commit 499350a5a6e7512d9ed369ed63a4244b6536f4f8 ] When tcp_disconnect() is called, inet_csk_delack_init() sets icsk->icsk_ack.rcv_mss to 0. This could potentially cause tcp_recvmsg() => tcp_cleanup_rbuf() => __tcp_select_window() call path to have division by 0 issue. So this patch initializes rcv_mss to TCP_MIN_MSS instead of 0. Reported-by: Andrey Konovalov Signed-off-by: Wei Wang Signed-off-by: Eric Dumazet Signed-off-by: Neal Cardwell Signed-off-by: Yuchung Cheng Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/tcp.c |4 1 file changed, 4 insertions(+) --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2260,6 +2260,10 @@ int tcp_disconnect(struct sock *sk, int tcp_set_ca_state(sk, TCP_CA_Open); tcp_clear_retrans(tp); inet_csk_delack_init(sk); + /* Initialize rcv_mss to TCP_MIN_MSS to avoid division by 0 +* issue in __tcp_select_window() +*/ + icsk->icsk_ack.rcv_mss = TCP_MIN_MSS; tcp_init_send_head(sk); memset(>rx_opt, 0, sizeof(tp->rx_opt)); __sk_dst_reset(sk);