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-rw-r--r--net/netlink/af_netlink.c22
1 files changed, 6 insertions, 16 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 2cbf380377d5..8648a9922aab 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -1406,7 +1406,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
struct netlink_sock *nlk = nlk_sk(sk);
int noblock = flags&MSG_DONTWAIT;
size_t copied;
- struct sk_buff *skb;
+ struct sk_buff *skb, *frag __maybe_unused = NULL;
int err;
if (flags&MSG_OOB)
@@ -1441,21 +1441,7 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
kfree_skb(skb);
skb = compskb;
} else {
- /*
- * Before setting frag_list to NULL, we must get a
- * private copy of skb if shared (because of MSG_PEEK)
- */
- if (skb_shared(skb)) {
- struct sk_buff *nskb;
-
- nskb = pskb_copy(skb, GFP_KERNEL);
- kfree_skb(skb);
- skb = nskb;
- err = -ENOMEM;
- if (!skb)
- goto out;
- }
- kfree_skb(skb_shinfo(skb)->frag_list);
+ frag = skb_shinfo(skb)->frag_list;
skb_shinfo(skb)->frag_list = NULL;
}
}
@@ -1492,6 +1478,10 @@ static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock,
if (flags & MSG_TRUNC)
copied = skb->len;
+#ifdef CONFIG_COMPAT_NETLINK_MESSAGES
+ skb_shinfo(skb)->frag_list = frag;
+#endif
+
skb_free_datagram(sk, skb);
if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2)