1 files changed, 3 insertions, 2 deletions

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index cd8a92e7a39e..e80eb1788f80 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -325,7 +325,7 @@ void tcp_enter_memory_pressure(struct sock *sk)
 {
         unsigned long val;
 
-        if (tcp_memory_pressure)
+        if (READ_ONCE(tcp_memory_pressure))
                 return;
         val = jiffies;
 
@@ -340,7 +340,7 @@ void tcp_leave_memory_pressure(struct sock *sk)
 {
         unsigned long val;
 
-        if (!tcp_memory_pressure)
+        if (!READ_ONCE(tcp_memory_pressure))
                 return;
         val = xchg(&tcp_memory_pressure, 0);
         if (val)
@@ -2507,6 +2507,7 @@ static void tcp_rtx_queue_purge(struct sock *sk)
 {
         struct rb_node *p = rb_first(&sk->tcp_rtx_queue);
 
+        tcp_sk(sk)->highest_sack = NULL;
         while (p) {
                 struct sk_buff *skb = rb_to_skb(p);