net, llc: convert llc_sap.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>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/llc/llc_core.c b/net/llc/llc_core.c
index 842851cef698..89041260784c 100644
--- a/net/llc/llc_core.c
+++ b/net/llc/llc_core.c
@@ -41,7 +41,7 @@ static struct llc_sap *llc_sap_alloc(void)
                 spin_lock_init(&sap->sk_lock);
                 for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++)
                         INIT_HLIST_NULLS_HEAD(&sap->sk_laddr_hash[i], i);
-                atomic_set(&sap->refcnt, 1);
+                refcount_set(&sap->refcnt, 1);
         }
         return sap;
 }