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Commit 72e09ad1 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

ipv6: avoid high order allocations 



With mtu=9000, mld_newpack() use order-2 GFP_ATOMIC allocations, that
are very unreliable, on machines where PAGE_SIZE=4K

Limit allocated skbs to be at most one page. (order-0 allocations)

Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ca733594

net/ipv6/mcast.c

+4 −1
Original line number Diff line number Diff line
@@ -1356,7 +1356,10 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size) 
		     IPV6_TLV_PADN, 0 };



	/* we assume size > sizeof(ra) here */

	skb = sock_alloc_send_skb(sk, size + LL_ALLOCATED_SPACE(dev), 1, &err);

	size += LL_ALLOCATED_SPACE(dev);

	/* limit our allocations to order-0 page */

	size = min_t(int, size, SKB_MAX_ORDER(0, 0));

	skb = sock_alloc_send_skb(sk, size, 1, &err);



	if (!skb)

		return NULL;