From: Patrick McHardy <kaber@trash.net>
Date: Thu, 15 Apr 2010 11:29:28 +0000 (+0200)
Subject: ipv4: ipmr: fix NULL pointer deref during unres queue destruction
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8de53dfbf9a0a0f7538c005137059c5c021476e1;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

ipv4: ipmr: fix NULL pointer deref during unres queue destruction

Fix an oversight in ipmr_destroy_unres() - the net pointer is
unconditionally initialized to NULL, resulting in a NULL pointer
dereference later on.

Fix by adding a net pointer to struct mr_table and using it in
ipmr_destroy_unres().

Signed-off-by: Patrick McHardy <kaber@trash.net>
---

diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 0643fb6d47c4..7d8a2bcecb76 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -71,6 +71,9 @@
 
 struct mr_table {
 	struct list_head	list;
+#ifdef CONFIG_NET_NS
+	struct net		*net;
+#endif
 	u32			id;
 	struct sock		*mroute_sk;
 	struct timer_list	ipmr_expire_timer;
@@ -308,6 +311,7 @@ static struct mr_table *ipmr_new_table(struct net *net, u32 id)
 	mrt = kzalloc(sizeof(*mrt), GFP_KERNEL);
 	if (mrt == NULL)
 		return NULL;
+	write_pnet(&mrt->net, net);
 	mrt->id = id;
 
 	/* Forwarding cache */
@@ -580,7 +584,7 @@ static inline void ipmr_cache_free(struct mfc_cache *c)
 
 static void ipmr_destroy_unres(struct mr_table *mrt, struct mfc_cache *c)
 {
-	struct net *net = NULL; //mrt->net;
+	struct net *net = read_pnet(&mrt->net);
 	struct sk_buff *skb;
 	struct nlmsgerr *e;