Commit 87078f26 authored by Reshetova, Elena's avatar Reshetova, Elena Committed by David S. Miller
Browse files

net, ipv6: convert ip6addrlbl_entry.refcnt from atomic_t to refcount_t

refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
Signed-off-by: default avatarElena Reshetova <>
Signed-off-by: default avatarHans Liljestrand <>
Signed-off-by: default avatarKees Cook <>
Signed-off-by: default avatarDavid Windsor <>
Signed-off-by: default avatarDavid S. Miller <>
parent d12f3827
......@@ -18,6 +18,7 @@
#include <linux/if_addrlabel.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/refcount.h>
#if 0
#define ADDRLABEL(x...) printk(x)
......@@ -36,7 +37,7 @@ struct ip6addrlbl_entry {
int addrtype;
u32 label;
struct hlist_node list;
atomic_t refcnt;
refcount_t refcnt;
struct rcu_head rcu;
......@@ -137,12 +138,12 @@ static void ip6addrlbl_free_rcu(struct rcu_head *h)
static bool ip6addrlbl_hold(struct ip6addrlbl_entry *p)
return atomic_inc_not_zero(&p->refcnt);
return refcount_inc_not_zero(&p->refcnt);
static inline void ip6addrlbl_put(struct ip6addrlbl_entry *p)
if (atomic_dec_and_test(&p->refcnt))
if (refcount_dec_and_test(&p->refcnt))
call_rcu(&p->rcu, ip6addrlbl_free_rcu);
......@@ -236,7 +237,7 @@ static struct ip6addrlbl_entry *ip6addrlbl_alloc(struct net *net,
newp->label = label;
write_pnet(&newp->lbl_net, net);
atomic_set(&newp->refcnt, 1);
refcount_set(&newp->refcnt, 1);
return newp;
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