From: Ben Hutchings Date: Fri, 24 Jun 2011 23:22:08 +0000 (+0100) Subject: sfc: Fix assertions in efx_filter_rfs() X-Git-Tag: firefly_0821_release~3680^2~5008^2~154^2~2 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=589327905cf0ce4402f7fb1ed29682f7ae68a82e;p=firefly-linux-kernel-4.4.55.git 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 --- diff --git a/drivers/net/sfc/filter.c b/drivers/net/sfc/filter.c index 054f0a3d45a9..2b9636f96e05 100644 --- 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);