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net, sctp: convert sctp_ep_common.refcnt from atomic_t to refcount_t

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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>
This commit is contained in:
Reshetova, Elena
2017-07-04 15:53:28 +03:00
committed by David S. Miller
parent a4b2b58efd
commit c638457a7c
3 changed files with 7 additions and 7 deletions
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6
net/sctp/associola.c
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@@ -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);
}