tcp: fix zero cwnd in tcp_cwnd_reduction

[karo-tx-linux.git] / net / ipv4 / tcp_input.c

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2d656eef7f8e16458127ba591e0a4154365f6a83..d4c51158470f5afb7cee8a5c875b5f9ed5b04e14 100644 (file)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -2478,6 +2478,9 @@ static void tcp_cwnd_reduction(struct sock *sk, const int prior_unsacked,
        int newly_acked_sacked = prior_unsacked -
                                 (tp->packets_out - tp->sacked_out);
 
+       if (newly_acked_sacked <= 0 || WARN_ON_ONCE(!tp->prior_cwnd))
+               return;
+
        tp->prr_delivered += newly_acked_sacked;
        if (delta < 0) {
                u64 dividend = (u64)tp->snd_ssthresh * tp->prr_delivered +