Commit aa3a0220 authored by Ken-ichirou MATSUZAWA's avatar Ken-ichirou MATSUZAWA Committed by David S. Miller

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: db65a3aa.

Fixes: db65a3aa (netlink: Trim skb to alloc size to avoid MSG_TRUNC)
Signed-off-by: default avatarKen-ichirou MATSUZAWA <chamas@h4.dion.ne.jp>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7256eac1
......@@ -2831,6 +2831,7 @@ 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.
*/
if (!netlink_rx_is_mmaped(sk))
skb_reserve(skb, skb_tailroom(skb) - alloc_size);
netlink_skb_set_owner_r(skb, sk);
......
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