From: Florian Westphal Date: Mon, 21 Nov 2016 09:08:37 +0000 (+0100) Subject: tcp: zero ca_priv area when switching cc algorithms X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7082c5c3f2407c52022507ffaf644dbbab97a883;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git tcp: zero ca_priv area when switching cc algorithms We need to zero out the private data area when application switches connection to different algorithm (TCP_CONGESTION setsockopt). When congestion ops get assigned at connect time everything is already zeroed because sk_alloc uses GFP_ZERO flag. But in the setsockopt case this contains whatever previous cc placed there. Signed-off-by: Florian Westphal Signed-off-by: David S. Miller --- diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c index 1294af4e0127..f9038d6b109e 100644 --- a/net/ipv4/tcp_cong.c +++ b/net/ipv4/tcp_cong.c @@ -200,8 +200,10 @@ static void tcp_reinit_congestion_control(struct sock *sk, icsk->icsk_ca_ops = ca; icsk->icsk_ca_setsockopt = 1; - if (sk->sk_state != TCP_CLOSE) + if (sk->sk_state != TCP_CLOSE) { + memset(icsk->icsk_ca_priv, 0, sizeof(icsk->icsk_ca_priv)); tcp_init_congestion_control(sk); + } } /* Manage refcounts on socket close. */