sfc: Fix assertions in efx_filter_rfs()

This function is intended to assert (when DEBUG is defined) that the
skb header area includes the header fields it's looking at, which RFS
should already have pulled.  But it uses pskb_may_pull(), which will
attempt to pull more data if necesary.  It must instead compare
skb_headlen() with the required length.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

diff --git a/drivers/net/sfc/filter.c b/drivers/net/sfc/filter.c
index 054f0a3d45a975010a04e7071a339c8a82f61ffb..2b9636f96e05769a5bba61ded58acf2b98a115ca 100644 (file)
--- a/drivers/net/sfc/filter.c
+++ b/drivers/net/sfc/filter.c
@@ -657,11 +657,11 @@ int efx_filter_rfs(struct net_device *net_dev, const struct sk_buff *skb,
                return -EPROTONOSUPPORT;
 
        /* RFS must validate the IP header length before calling us */
-       EFX_BUG_ON_PARANOID(!pskb_may_pull(skb, nhoff + sizeof(*ip)));
+       EFX_BUG_ON_PARANOID(skb_headlen(skb) < nhoff + sizeof(*ip));
        ip = (const struct iphdr *)(skb->data + nhoff);
        if (ip_is_fragment(ip))
                return -EPROTONOSUPPORT;
-       EFX_BUG_ON_PARANOID(!pskb_may_pull(skb, nhoff + 4 * ip->ihl + 4));
+       EFX_BUG_ON_PARANOID(skb_headlen(skb) < nhoff + 4 * ip->ihl + 4);
        ports = (const __be16 *)(skb->data + nhoff + 4 * ip->ihl);
 
        efx_filter_init_rx(&spec, EFX_FILTER_PRI_HINT, 0, rxq_index);