diff options
| author | Reshetova, Elena | 2017-07-04 09:35:00 +0300 |
|---|---|---|
| committer | David S. Miller | 2017-07-04 01:29:04 -0700 |
| commit | 87078f26b6644c2ad8226cf29a7e3a6ef6c74ae2 (patch) | |
| tree | 77a80a2e7ecc574c88c7e44371a03962e4d94f59 /net | |
| parent | d12f3827e04b58f617c43f4d44ad3ad788d852b7 (diff) | |
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
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/addrlabel.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c index 07cd7d248bb6..7a428f65c7ec 100644 --- a/net/ipv6/addrlabel.c +++ b/net/ipv6/addrlabel.c @@ -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; INIT_HLIST_NODE(&newp->list); write_pnet(&newp->lbl_net, net); - atomic_set(&newp->refcnt, 1); + refcount_set(&newp->refcnt, 1); return newp; } |