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

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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>
This commit is contained in:
Patrick McHardy 2010-04-15 13:29:28 +02:00
parent b0ebb739a8
commit 8de53dfbf9
1 changed files with 5 additions and 1 deletions
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6
net/ipv4/ipmr.c
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@ -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;