Return-Path: Received: from mga07.intel.com ([134.134.136.100]:60652 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752173AbdGDM5a (ORCPT ); Tue, 4 Jul 2017 08:57:30 -0400 From: Elena Reshetova To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-decnet-user@lists.sourceforge.net, davem@davemloft.net, jmorris@namei.org, kaber@trash.net, yoshfuji@linux-ipv6.org, kuznet@ms2.inr.ac.ru, 3chas3@gmail.com, ralf@linux-mips.org, stephen@networkplumber.org, jchapman@katalix.com, jhs@mojatatu.com, bridge@lists.linux-foundation.org, linux-hams@vger.kernel.org, linux-x25@vger.kernel.org, peterz@infradead.org, keescook@chromium.org, linux-rdma@vger.kernel.org, linux-sctp@vger.kernel.org, vyasevich@gmail.com, nhorman@tuxdriver.com, linux-nfs@vger.kernel.org, zyan@redhat.com, sage@redhat.com, bfields@fieldses.org, jlayton@poochiereds.net, steffen.klassert@secunet.com, herbert@gondor.apana.org.au, santosh.shilimkar@oracle.com, jreuter@yaina.de, Elena Reshetova , Hans Liljestrand , David Windsor Subject: [PATCH 24/36] net, x25: convert x25_route.refcnt from atomic_t to refcount_t Date: Tue, 4 Jul 2017 15:53:19 +0300 Message-Id: <1499172811-16271-25-git-send-email-elena.reshetova@intel.com> In-Reply-To: <1499172811-16271-1-git-send-email-elena.reshetova@intel.com> References: <1499172811-16271-1-git-send-email-elena.reshetova@intel.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: 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 Signed-off-by: Hans Liljestrand Signed-off-by: Kees Cook Signed-off-by: David Windsor --- include/net/x25.h | 7 ++++--- net/x25/x25_route.c | 2 +- 2 files changed, 5 insertions(+), 4 deletions(-) diff --git a/include/net/x25.h b/include/net/x25.h index 6d30a01..1ac1400 100644 --- a/include/net/x25.h +++ b/include/net/x25.h @@ -11,6 +11,7 @@ #define _X25_H #include #include +#include #include #define X25_ADDR_LEN 16 @@ -129,7 +130,7 @@ struct x25_route { struct x25_address address; unsigned int sigdigits; struct net_device *dev; - atomic_t refcnt; + refcount_t refcnt; }; struct x25_neigh { @@ -265,12 +266,12 @@ void x25_route_free(void); static __inline__ void x25_route_hold(struct x25_route *rt) { - atomic_inc(&rt->refcnt); + refcount_inc(&rt->refcnt); } static __inline__ void x25_route_put(struct x25_route *rt) { - if (atomic_dec_and_test(&rt->refcnt)) + if (refcount_dec_and_test(&rt->refcnt)) kfree(rt); } diff --git a/net/x25/x25_route.c b/net/x25/x25_route.c index 277c8d2..b85b889 100644 --- a/net/x25/x25_route.c +++ b/net/x25/x25_route.c @@ -55,7 +55,7 @@ static int x25_add_route(struct x25_address *address, unsigned int sigdigits, rt->sigdigits = sigdigits; rt->dev = dev; - atomic_set(&rt->refcnt, 1); + refcount_set(&rt->refcnt, 1); list_add(&rt->node, &x25_route_list); rc = 0; -- 2.7.4