1 files changed, 16 insertions, 11 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 524712a7b154..7626b6aacd68 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -446,7 +446,7 @@ static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
  */
 
 int sock_setsockopt(struct socket *sock, int level, int optname,
-                    char __user *optval, int optlen)
+                    char __user *optval, unsigned int optlen)
 {
         struct sock *sk = sock->sk;
         int val;
@@ -1228,17 +1228,22 @@ void __init sk_init(void)
 void sock_wfree(struct sk_buff *skb)
 {
         struct sock *sk = skb->sk;
-        int res;
+        unsigned int len = skb->truesize;
 
-        /* In case it might be waiting for more memory. */
-        res = atomic_sub_return(skb->truesize, &sk->sk_wmem_alloc);
-        if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
+        if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
+                /*
+                 * Keep a reference on sk_wmem_alloc, this will be released
+                 * after sk_write_space() call
+                 */
+                atomic_sub(len - 1, &sk->sk_wmem_alloc);
                 sk->sk_write_space(sk);
+                len = 1;
+        }
         /*
-         * if sk_wmem_alloc reached 0, we are last user and should
-         * free this sock, as sk_free() call could not do it.
+         * if sk_wmem_alloc reaches 0, we must finish what sk_free()
+         * could not do because of in-flight packets
          */
-        if (res == 0)
+        if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
                 __sk_free(sk);
 }
 EXPORT_SYMBOL(sock_wfree);
@@ -1697,7 +1702,7 @@ int sock_no_shutdown(struct socket *sock, int how)
 EXPORT_SYMBOL(sock_no_shutdown);
 
 int sock_no_setsockopt(struct socket *sock, int level, int optname,
-                    char __user *optval, int optlen)
+                    char __user *optval, unsigned int optlen)
 {
         return -EOPNOTSUPP;
 }
@@ -2018,7 +2023,7 @@ EXPORT_SYMBOL(sock_common_recvmsg);
  *      Set socket options on an inet socket.
  */
 int sock_common_setsockopt(struct socket *sock, int level, int optname,
-                           char __user *optval, int optlen)
+                           char __user *optval, unsigned int optlen)
 {
         struct sock *sk = sock->sk;
 
@@ -2028,7 +2033,7 @@ EXPORT_SYMBOL(sock_common_setsockopt);
 
 #ifdef CONFIG_COMPAT
 int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
-                                  char __user *optval, int optlen)
+                                  char __user *optval, unsigned int optlen)
 {
         struct sock *sk = sock->sk;