X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=net%2Fipv4%2Ftcp_input.c;h=d4c51158470f5afb7cee8a5c875b5f9ed5b04e14;hb=8b8a321ff72c785ed5e8b4cf6eda20b35d427390;hp=2d656eef7f8e16458127ba591e0a4154365f6a83;hpb=f41683a204ea61568f0fd0804d47c19561f2ee39;p=karo-tx-linux.git

diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2d656eef7f8e..d4c51158470f 100644
--- 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 +