[PATCH net] gre: do not pull header in ICMP error processing

[Jiri Benc]

iptunnel_pull_header expects that IP header was already pulled; with this
expectation, it pulls the tunnel header. This is not true in gre_err.
Furthermore, ipv4_update_pmtu and ipv4_redirect expect that skb->data points
to the IP header.

We cannot pull the tunnel header in this path. It's just a matter of not
calling iptunnel_pull_header - we don't need any of its effects.

Fixes: bda7bb463436 ("gre: Allow multiple protocol listener for gre protocol.")
Signed-off-by: Jiri Benc <jb...@redhat.com>
---
 net/ipv4/ip_gre.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index f502d34bcb40..205a2b8a5a84 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -179,6 +179,7 @@ static __be16 tnl_flags_to_gre_flags(__be16 tflags)
        return flags;
 }
 
+/* Fills in tpi and returns header length to be pulled. */
 static int parse_gre_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
                            bool *csum_err)
 {
@@ -238,7 +239,7 @@ static int parse_gre_header(struct sk_buff *skb, struct 
tnl_ptk_info *tpi,
                                return -EINVAL;
                }
        }
-       return iptunnel_pull_header(skb, hdr_len, tpi->proto, false);
+       return hdr_len;
 }
 
 static void ipgre_err(struct sk_buff *skb, u32 info,
@@ -341,7 +342,7 @@ static void gre_err(struct sk_buff *skb, u32 info)
        struct tnl_ptk_info tpi;
        bool csum_err = false;
 
-       if (parse_gre_header(skb, &tpi, &csum_err)) {
+       if (parse_gre_header(skb, &tpi, &csum_err) < 0) {
                if (!csum_err)          /* ignore csum errors. */
                        return;
        }
@@ -419,6 +420,7 @@ static int gre_rcv(struct sk_buff *skb)
 {
        struct tnl_ptk_info tpi;
        bool csum_err = false;
+       int hdr_len;
 
 #ifdef CONFIG_NET_IPGRE_BROADCAST
        if (ipv4_is_multicast(ip_hdr(skb)->daddr)) {
@@ -428,7 +430,10 @@ static int gre_rcv(struct sk_buff *skb)
        }
 #endif
 
-       if (parse_gre_header(skb, &tpi, &csum_err) < 0)
+       hdr_len = parse_gre_header(skb, &tpi, &csum_err);
+       if (hdr_len < 0)
+               goto drop;
+       if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false) < 0)
                goto drop;
 
        if (ipgre_rcv(skb, &tpi) == PACKET_RCVD)
-- 
1.8.3.1