From daa3766e705c2605bd7f63b80c7742014ef9e04e Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Sun, 15 Aug 2010 23:21:50 -0700 Subject: [PATCH] Revert "netlink: netlink_recvmsg() fix" This reverts commit 1235f504aaba2ebeabc863fdb3ceac764a317d47. It causes regressions worse than the problem it was trying to fix. Eric will try to solve the problem another way. Signed-off-by: David S. Miller --- net/netlink/af_netlink.c | 22 ++++++---------------- 1 file changed, 6 insertions(+), 16 deletions(-) diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 2cbf380..8648a99 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) -- 2.7.4