Merge tag 'driver-core-3.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git...

[~andy/linux] / net / ipv4 / tcp_input.c

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 28af45abe0622fabac4d53ab651099a580808766..3ca2139a130b1034bf24f212fa79b59ea8b8416f 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -3535,7 +3535,10 @@ static bool tcp_parse_aligned_timestamp(struct tcp_sock *tp, const struct tcphdr
                ++ptr;
                tp->rx_opt.rcv_tsval = ntohl(*ptr);
                ++ptr;
-               tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
+               if (*ptr)
+                       tp->rx_opt.rcv_tsecr = ntohl(*ptr) - tp->tsoffset;
+               else
+                       tp->rx_opt.rcv_tsecr = 0;
                return true;
        }
        return false;
@@ -3560,7 +3563,7 @@ static bool tcp_fast_parse_options(const struct sk_buff *skb,
        }
 
        tcp_parse_options(skb, &tp->rx_opt, 1, NULL);
-       if (tp->rx_opt.saw_tstamp)
+       if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr)
                tp->rx_opt.rcv_tsecr -= tp->tsoffset;
 
        return true;
@@ -5316,7 +5319,7 @@ static int tcp_rcv_synsent_state_process(struct sock *sk, struct sk_buff *skb,
        int saved_clamp = tp->rx_opt.mss_clamp;
 
        tcp_parse_options(skb, &tp->rx_opt, 0, &foc);
-       if (tp->rx_opt.saw_tstamp)
+       if (tp->rx_opt.saw_tstamp && tp->rx_opt.rcv_tsecr)
                tp->rx_opt.rcv_tsecr -= tp->tsoffset;
 
        if (th->ack) {