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@xxxxxxxxx>
Signed-off-by: Hans Liljestrand <ishkamiel@xxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: David Windsor <dwindsor@xxxxxxxxx>
---
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 ac3184e..7a9ce11 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1170,7 +1170,7 @@ 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 2a6835b..e5b60b5 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -89,7 +89,7 @@ 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);
@@ -869,7 +869,7 @@ 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
@@ -877,7 +877,7 @@ 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 8c58923..9189a9f 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -113,7 +113,7 @@ 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
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