[ 07/11] [PATCH 3.0.y] route: release dst_entry.hh_cache when handling redirects

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Michal Kubecek <redacted>

Stable-3.0 commit 42ab5316 (ipv4: fix redirect handling) was
backport of mainline commit 9cc20b26 from 3.2-rc3 where hh
member of struct dst_entry was already gone.

However, in 3.0 we still have it and we have to clean it as
well, otherwise it keeps pointing to the cleaned up (and
unusable) hh_cache entry and packets cannot be sent out.

Signed-off-by: Michal Kubecek <redacted>
Cc: Eric Dumazet <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/route.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c

@@ -1374,6 +1374,7 @@ static int check_peer_redir(struct dst_e
 	struct rtable *rt = (struct rtable *) dst;
 	__be32 orig_gw = rt->rt_gateway;
 	struct neighbour *n, *old_n;
+	struct hh_cache *old_hh;
 
 	dst_confirm(&rt->dst);
 

@@ -1381,6 +1382,9 @@ static int check_peer_redir(struct dst_e
 	n = __arp_bind_neighbour(&rt->dst, rt->rt_gateway);
 	if (IS_ERR(n))
 		return PTR_ERR(n);
+	old_hh = xchg(&rt->dst.hh, NULL);
+	if (old_hh)
+		hh_cache_put(old_hh);
 	old_n = xchg(&rt->dst._neighbour, n);
 	if (old_n)
 		neigh_release(old_n);