Return-Path: Received: from mga09.intel.com ([134.134.136.24]:47714 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752707AbdGDM6e (ORCPT ); Tue, 4 Jul 2017 08:58:34 -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 33/36] net, sctp: convert sctp_ep_common.refcnt from atomic_t to refcount_t Date: Tue, 4 Jul 2017 15:53:28 +0300 Message-Id: <1499172811-16271-34-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/sctp/structs.h | 2 +- net/sctp/associola.c | 6 +++--- net/sctp/endpointola.c | 6 +++--- 3 files changed, 7 insertions(+), 7 deletions(-) diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h index 6a0d372..5ab29af 100644 --- a/include/net/sctp/structs.h +++ b/include/net/sctp/structs.h @@ -1174,7 +1174,7 @@ struct sctp_ep_common { * refcnt - Reference count access to this object. * dead - Do not attempt to use this object. */ - atomic_t refcnt; + refcount_t refcnt; bool dead; /* What socket does this endpoint belong to? */ diff --git a/net/sctp/associola.c b/net/sctp/associola.c index fa4f530..40ec836 100644 --- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -88,7 +88,7 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a asoc->base.type = SCTP_EP_TYPE_ASSOCIATION; /* Initialize the object handling fields. */ - atomic_set(&asoc->base.refcnt, 1); + refcount_set(&asoc->base.refcnt, 1); /* Initialize the bind addr area. */ sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port); @@ -873,7 +873,7 @@ void sctp_assoc_control_transport(struct sctp_association *asoc, /* Hold a reference to an association. */ void sctp_association_hold(struct sctp_association *asoc) { - atomic_inc(&asoc->base.refcnt); + refcount_inc(&asoc->base.refcnt); } /* Release a reference to an association and cleanup @@ -881,7 +881,7 @@ void sctp_association_hold(struct sctp_association *asoc) */ void sctp_association_put(struct sctp_association *asoc) { - if (atomic_dec_and_test(&asoc->base.refcnt)) + if (refcount_dec_and_test(&asoc->base.refcnt)) sctp_association_destroy(asoc); } diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c index efbc318..0e86f98 100644 --- a/net/sctp/endpointola.c +++ b/net/sctp/endpointola.c @@ -114,7 +114,7 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep, ep->base.type = SCTP_EP_TYPE_SOCKET; /* Initialize the basic object fields. */ - atomic_set(&ep->base.refcnt, 1); + refcount_set(&ep->base.refcnt, 1); ep->base.dead = false; /* Create an input queue. */ @@ -285,7 +285,7 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep) /* Hold a reference to an endpoint. */ void sctp_endpoint_hold(struct sctp_endpoint *ep) { - atomic_inc(&ep->base.refcnt); + refcount_inc(&ep->base.refcnt); } /* Release a reference to an endpoint and clean up if there are @@ -293,7 +293,7 @@ void sctp_endpoint_hold(struct sctp_endpoint *ep) */ void sctp_endpoint_put(struct sctp_endpoint *ep) { - if (atomic_dec_and_test(&ep->base.refcnt)) + if (refcount_dec_and_test(&ep->base.refcnt)) sctp_endpoint_destroy(ep); } -- 2.7.4