diff -druNp --no-dereference linux-libre-4.4.181-gnu/Documentation/networking/ip-sysctl.txt linux-libre-4.4.182-gnu/Documentation/networking/ip-sysctl.txt
--- linux-libre-4.4.181-gnu/Documentation/networking/ip-sysctl.txt	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/Documentation/networking/ip-sysctl.txt	2019-06-17 13:54:23.000000000 -0400
@@ -220,6 +220,14 @@ tcp_base_mss - INTEGER
 	Path MTU discovery (MTU probing).  If MTU probing is enabled,
 	this is the initial MSS used by the connection.
 
+tcp_min_snd_mss - INTEGER
+	TCP SYN and SYNACK messages usually advertise an ADVMSS option,
+	as described in RFC 1122 and RFC 6691.
+	If this ADVMSS option is smaller than tcp_min_snd_mss,
+	it is silently capped to tcp_min_snd_mss.
+
+	Default : 48 (at least 8 bytes of payload per segment)
+
 tcp_congestion_control - STRING
 	Set the congestion control algorithm to be used for new
 	connections. The algorithm "reno" is always available, but
diff -druNp --no-dereference linux-libre-4.4.181-gnu/include/linux/tcp.h linux-libre-4.4.182-gnu/include/linux/tcp.h
--- linux-libre-4.4.181-gnu/include/linux/tcp.h	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/include/linux/tcp.h	2019-06-17 13:54:23.000000000 -0400
@@ -419,4 +419,7 @@ static inline void tcp_saved_syn_free(st
 	tp->saved_syn = NULL;
 }
 
+int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount,
+		  int shiftlen);
+
 #endif	/* _LINUX_TCP_H */
diff -druNp --no-dereference linux-libre-4.4.181-gnu/include/net/netns/ipv4.h linux-libre-4.4.182-gnu/include/net/netns/ipv4.h
--- linux-libre-4.4.181-gnu/include/net/netns/ipv4.h	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/include/net/netns/ipv4.h	2019-06-17 13:54:23.000000000 -0400
@@ -88,6 +88,7 @@ struct netns_ipv4 {
 	int sysctl_tcp_fwmark_accept;
 	int sysctl_tcp_mtu_probing;
 	int sysctl_tcp_base_mss;
+	int sysctl_tcp_min_snd_mss;
 	int sysctl_tcp_probe_threshold;
 	u32 sysctl_tcp_probe_interval;
 
diff -druNp --no-dereference linux-libre-4.4.181-gnu/include/net/tcp.h linux-libre-4.4.182-gnu/include/net/tcp.h
--- linux-libre-4.4.181-gnu/include/net/tcp.h	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/include/net/tcp.h	2019-06-17 13:54:23.000000000 -0400
@@ -54,6 +54,8 @@ void tcp_time_wait(struct sock *sk, int
 
 #define MAX_TCP_HEADER	(128 + MAX_HEADER)
 #define MAX_TCP_OPTION_SPACE 40
+#define TCP_MIN_SND_MSS		48
+#define TCP_MIN_GSO_SIZE	(TCP_MIN_SND_MSS - MAX_TCP_OPTION_SPACE)
 
 /*
  * Never offer a window over 32767 without using window scaling. Some
diff -druNp --no-dereference linux-libre-4.4.181-gnu/include/uapi/linux/snmp.h linux-libre-4.4.182-gnu/include/uapi/linux/snmp.h
--- linux-libre-4.4.181-gnu/include/uapi/linux/snmp.h	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/include/uapi/linux/snmp.h	2019-06-17 13:54:23.000000000 -0400
@@ -281,6 +281,7 @@ enum
 	LINUX_MIB_TCPKEEPALIVE,			/* TCPKeepAlive */
 	LINUX_MIB_TCPMTUPFAIL,			/* TCPMTUPFail */
 	LINUX_MIB_TCPMTUPSUCCESS,		/* TCPMTUPSuccess */
+	LINUX_MIB_TCPWQUEUETOOBIG,		/* TCPWqueueTooBig */
 	__LINUX_MIB_MAX
 };
 
diff -druNp --no-dereference linux-libre-4.4.181-gnu/Makefile linux-libre-4.4.182-gnu/Makefile
--- linux-libre-4.4.181-gnu/Makefile	2019-06-11 17:51:10.000000000 -0400
+++ linux-libre-4.4.182-gnu/Makefile	2019-06-17 21:19:50.000000000 -0400
@@ -1,6 +1,6 @@
 VERSION = 4
 PATCHLEVEL = 4
-SUBLEVEL = 181
+SUBLEVEL = 182
 EXTRAVERSION = -gnu
 NAME = Blurry Fish Butt
 
diff -druNp --no-dereference linux-libre-4.4.181-gnu/net/ipv4/proc.c linux-libre-4.4.182-gnu/net/ipv4/proc.c
--- linux-libre-4.4.181-gnu/net/ipv4/proc.c	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/net/ipv4/proc.c	2019-06-17 13:54:23.000000000 -0400
@@ -303,6 +303,7 @@ static const struct snmp_mib snmp4_net_l
 	SNMP_MIB_ITEM("TCPKeepAlive", LINUX_MIB_TCPKEEPALIVE),
 	SNMP_MIB_ITEM("TCPMTUPFail", LINUX_MIB_TCPMTUPFAIL),
 	SNMP_MIB_ITEM("TCPMTUPSuccess", LINUX_MIB_TCPMTUPSUCCESS),
+	SNMP_MIB_ITEM("TCPWqueueTooBig", LINUX_MIB_TCPWQUEUETOOBIG),
 	SNMP_MIB_SENTINEL
 };
 
diff -druNp --no-dereference linux-libre-4.4.181-gnu/net/ipv4/sysctl_net_ipv4.c linux-libre-4.4.182-gnu/net/ipv4/sysctl_net_ipv4.c
--- linux-libre-4.4.181-gnu/net/ipv4/sysctl_net_ipv4.c	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/net/ipv4/sysctl_net_ipv4.c	2019-06-17 13:54:23.000000000 -0400
@@ -36,6 +36,8 @@ static int ip_local_port_range_min[] = {
 static int ip_local_port_range_max[] = { 65535, 65535 };
 static int tcp_adv_win_scale_min = -31;
 static int tcp_adv_win_scale_max = 31;
+static int tcp_min_snd_mss_min = TCP_MIN_SND_MSS;
+static int tcp_min_snd_mss_max = 65535;
 static int ip_ttl_min = 1;
 static int ip_ttl_max = 255;
 static int tcp_syn_retries_min = 1;
@@ -942,6 +944,15 @@ static struct ctl_table ipv4_net_table[]
 		.proc_handler	= proc_dointvec,
 	},
 	{
+		.procname	= "tcp_min_snd_mss",
+		.data		= &init_net.ipv4.sysctl_tcp_min_snd_mss,
+		.maxlen		= sizeof(int),
+		.mode		= 0644,
+		.proc_handler	= proc_dointvec_minmax,
+		.extra1		= &tcp_min_snd_mss_min,
+		.extra2		= &tcp_min_snd_mss_max,
+	},
+	{
 		.procname	= "tcp_probe_threshold",
 		.data		= &init_net.ipv4.sysctl_tcp_probe_threshold,
 		.maxlen		= sizeof(int),
diff -druNp --no-dereference linux-libre-4.4.181-gnu/net/ipv4/tcp.c linux-libre-4.4.182-gnu/net/ipv4/tcp.c
--- linux-libre-4.4.181-gnu/net/ipv4/tcp.c	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/net/ipv4/tcp.c	2019-06-17 13:54:23.000000000 -0400
@@ -3144,6 +3144,7 @@ void __init tcp_init(void)
 	int max_rshare, max_wshare, cnt;
 	unsigned int i;
 
+	BUILD_BUG_ON(TCP_MIN_SND_MSS <= MAX_TCP_OPTION_SPACE);
 	sock_skb_cb_check_size(sizeof(struct tcp_skb_cb));
 
 	percpu_counter_init(&tcp_sockets_allocated, 0, GFP_KERNEL);
diff -druNp --no-dereference linux-libre-4.4.181-gnu/net/ipv4/tcp_input.c linux-libre-4.4.182-gnu/net/ipv4/tcp_input.c
--- linux-libre-4.4.181-gnu/net/ipv4/tcp_input.c	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/net/ipv4/tcp_input.c	2019-06-17 13:54:23.000000000 -0400
@@ -1275,7 +1275,7 @@ static bool tcp_shifted_skb(struct sock
 	TCP_SKB_CB(skb)->seq += shifted;
 
 	tcp_skb_pcount_add(prev, pcount);
-	BUG_ON(tcp_skb_pcount(skb) < pcount);
+	WARN_ON_ONCE(tcp_skb_pcount(skb) < pcount);
 	tcp_skb_pcount_add(skb, -pcount);
 
 	/* When we're adding to gso_segs == 1, gso_size will be zero,
@@ -1337,6 +1337,21 @@ static int skb_can_shift(const struct sk
 	return !skb_headlen(skb) && skb_is_nonlinear(skb);
 }
 
+int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from,
+		  int pcount, int shiftlen)
+{
+	/* TCP min gso_size is 8 bytes (TCP_MIN_GSO_SIZE)
+	 * Since TCP_SKB_CB(skb)->tcp_gso_segs is 16 bits, we need
+	 * to make sure not storing more than 65535 * 8 bytes per skb,
+	 * even if current MSS is bigger.
+	 */
+	if (unlikely(to->len + shiftlen >= 65535 * TCP_MIN_GSO_SIZE))
+		return 0;
+	if (unlikely(tcp_skb_pcount(to) + pcount > 65535))
+		return 0;
+	return skb_shift(to, from, shiftlen);
+}
+
 /* Try collapsing SACK blocks spanning across multiple skbs to a single
  * skb.
  */
@@ -1348,6 +1363,7 @@ static struct sk_buff *tcp_shift_skb_dat
 	struct tcp_sock *tp = tcp_sk(sk);
 	struct sk_buff *prev;
 	int mss;
+	int next_pcount;
 	int pcount = 0;
 	int len;
 	int in_sack;
@@ -1442,7 +1458,7 @@ static struct sk_buff *tcp_shift_skb_dat
 	if (!after(TCP_SKB_CB(skb)->seq + len, tp->snd_una))
 		goto fallback;
 
-	if (!skb_shift(prev, skb, len))
+	if (!tcp_skb_shift(prev, skb, pcount, len))
 		goto fallback;
 	if (!tcp_shifted_skb(sk, skb, state, pcount, len, mss, dup_sack))
 		goto out;
@@ -1461,11 +1477,11 @@ static struct sk_buff *tcp_shift_skb_dat
 		goto out;
 
 	len = skb->len;
-	if (skb_shift(prev, skb, len)) {
-		pcount += tcp_skb_pcount(skb);
-		tcp_shifted_skb(sk, skb, state, tcp_skb_pcount(skb), len, mss, 0);
+	next_pcount = tcp_skb_pcount(skb);
+	if (tcp_skb_shift(prev, skb, next_pcount, len)) {
+		pcount += next_pcount;
+		tcp_shifted_skb(sk, skb, state, next_pcount, len, mss, 0);
 	}
-
 out:
 	state->fack_count += pcount;
 	return prev;
diff -druNp --no-dereference linux-libre-4.4.181-gnu/net/ipv4/tcp_ipv4.c linux-libre-4.4.182-gnu/net/ipv4/tcp_ipv4.c
--- linux-libre-4.4.181-gnu/net/ipv4/tcp_ipv4.c	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/net/ipv4/tcp_ipv4.c	2019-06-17 13:54:23.000000000 -0400
@@ -2419,6 +2419,7 @@ static int __net_init tcp_sk_init(struct
 	net->ipv4.sysctl_tcp_ecn_fallback = 1;
 
 	net->ipv4.sysctl_tcp_base_mss = TCP_BASE_MSS;
+	net->ipv4.sysctl_tcp_min_snd_mss = TCP_MIN_SND_MSS;
 	net->ipv4.sysctl_tcp_probe_threshold = TCP_PROBE_THRESHOLD;
 	net->ipv4.sysctl_tcp_probe_interval = TCP_PROBE_INTERVAL;
 
diff -druNp --no-dereference linux-libre-4.4.181-gnu/net/ipv4/tcp_output.c linux-libre-4.4.182-gnu/net/ipv4/tcp_output.c
--- linux-libre-4.4.181-gnu/net/ipv4/tcp_output.c	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/net/ipv4/tcp_output.c	2019-06-17 13:54:23.000000000 -0400
@@ -1161,6 +1161,11 @@ int tcp_fragment(struct sock *sk, struct
 	if (nsize < 0)
 		nsize = 0;
 
+	if (unlikely((sk->sk_wmem_queued >> 1) > sk->sk_sndbuf)) {
+		NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPWQUEUETOOBIG);
+		return -ENOMEM;
+	}
+
 	if (skb_unclone(skb, gfp))
 		return -ENOMEM;
 
@@ -1327,8 +1332,7 @@ static inline int __tcp_mtu_to_mss(struc
 	mss_now -= icsk->icsk_ext_hdr_len;
 
 	/* Then reserve room for full set of TCP options and 8 bytes of data */
-	if (mss_now < 48)
-		mss_now = 48;
+	mss_now = max(mss_now, sock_net(sk)->ipv4.sysctl_tcp_min_snd_mss);
 	return mss_now;
 }
 
diff -druNp --no-dereference linux-libre-4.4.181-gnu/net/ipv4/tcp_timer.c linux-libre-4.4.182-gnu/net/ipv4/tcp_timer.c
--- linux-libre-4.4.181-gnu/net/ipv4/tcp_timer.c	2019-06-11 06:24:13.000000000 -0400
+++ linux-libre-4.4.182-gnu/net/ipv4/tcp_timer.c	2019-06-17 13:54:23.000000000 -0400
@@ -132,6 +132,7 @@ static void tcp_mtu_probing(struct inet_
 			mss = tcp_mtu_to_mss(sk, icsk->icsk_mtup.search_low) >> 1;
 			mss = min(net->ipv4.sysctl_tcp_base_mss, mss);
 			mss = max(mss, 68 - tp->tcp_header_len);
+			mss = max(mss, net->ipv4.sysctl_tcp_min_snd_mss);
 			icsk->icsk_mtup.search_low = tcp_mss_to_mtu(sk, mss);
 			tcp_sync_mss(sk, icsk->icsk_pmtu_cookie);
 		}
