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netlink: not trim skb for mmaped socket when dump 

We should not trim skb for mmaped socket since its buf size is fixed
and userspace will read as frame which data equals head. mmaped
socket will not call recvmsg, means max_recvmsg_len is 0,
skb_reserve was not called before commit: db65a3aaf2.

Fixes: db65a3aaf2 (netlink: Trim skb to alloc size to avoid MSG_TRUNC)
Signed-off-by: Ken-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ken-ichirou MATSUZAWA 2016-01-29 10:45:50 +09:00 committed by David S. Miller
parent 7256eac13b
commit aa3a022094
1 changed files with 2 additions and 1 deletions
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3
net/netlink/af_netlink.c
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@ -2831,7 +2831,8 @@ static int netlink_dump(struct sock *sk)
* reasonable static buffer based on the expected largest dump of a
* single netdev. The outcome is MSG_TRUNC error.
*/
skb_reserve(skb, skb_tailroom(skb) - alloc_size);
if (!netlink_rx_is_mmaped(sk))
skb_reserve(skb, skb_tailroom(skb) - alloc_size);
netlink_skb_set_owner_r(skb, sk);
len = cb->dump(skb, cb);