packet: Add needed_tailroom to packet_sendmsg_spkt

packet: Add needed_tailroom to packet_sendmsg_spkt

While auditing LL_ALLOCATED_SPACE I noticed that packet_sendmsg_spkt
did not include needed_tailroom when allocating an skb.  This isn't
a fatal error as we should always tolerate inadequate tail room but
it isn't optimal.

This patch fixes that.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 71c1a7521d32..0da505c9ac23 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1499,10 +1499,11 @@ retry:
 
         if (!skb) {
                 size_t reserved = LL_RESERVED_SPACE(dev);
+                int tlen = dev->needed_tailroom;
                 unsigned int hhlen = dev->header_ops ? dev->hard_header_len : 0;
 
                 rcu_read_unlock();
-                skb = sock_wmalloc(sk, len + reserved, 0, GFP_KERNEL);
+                skb = sock_wmalloc(sk, len + reserved + tlen, 0, GFP_KERNEL);
                 if (skb == NULL)
                         return -ENOBUFS;
                 /* FIXME: Save some space for broken drivers that write a hard