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-rw-r--r--net/netlink/af_netlink.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index 81dc1bb6e016..f1ffb34e253f 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -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);