From: Eric Dumazet Date: Sat, 5 Jun 2010 10:03:30 +0000 (-0700) Subject: ipv6: avoid high order allocations X-Git-Tag: firefly_0821_release~9833^2~1353^2~130 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=72e09ad107e7;p=firefly-linux-kernel-4.4.55.git 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: Eric Dumazet Signed-off-by: David S. Miller --- diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c index 59f1881968c7..ab1622d7d409 100644 --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -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;