net: sctp: remove sctp_ep_common struct member 'malloced'

There is actually no need to keep this member in the structure, because
after init it's always 1 anyway, thus always kfree called. This seems to
be an ancient leftover from the very initial implementation from 2.5
times. Only in case the initialization of an association fails, we leave
base.malloced as 0, but we nevertheless kfree it in the error path in
sctp_association_new().

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/sctp/structs.h

@@ -1174,11 +1174,9 @@ struct sctp_ep_common {
 	/* Some fields to help us manage this object.
 	 *   refcnt   - Reference count access to this object.
 	 *   dead     - Do not attempt to use this object.
-	 *   malloced - Do we need to kfree this object?
 	 */
 	atomic_t    refcnt;
 	char	    dead;
-	char	    malloced;
 
 	/* What socket does this endpoint belong to?  */
 	struct sock *sk;

net/sctp/associola.c

@@ -105,7 +105,6 @@ static struct sctp_association *sctp_association_init(struct sctp_association *a
 	/* Initialize the object handling fields.  */
 	atomic_set(&asoc->base.refcnt, 1);
 	asoc->base.dead = 0;
-	asoc->base.malloced = 0;
 
 	/* Initialize the bind addr area.  */
 	sctp_bind_addr_init(&asoc->base.bind_addr, ep->base.bind_addr.port);
@@ -371,7 +370,6 @@ struct sctp_association *sctp_association_new(const struct sctp_endpoint *ep,
 	if (!sctp_association_init(asoc, ep, sk, scope, gfp))
 		goto fail_init;
 
-	asoc->base.malloced = 1;
 	SCTP_DBG_OBJCNT_INC(assoc);
 	SCTP_DEBUG_PRINTK("Created asoc %p\n", asoc);
 
@@ -484,10 +482,8 @@ static void sctp_association_destroy(struct sctp_association *asoc)
 
 	WARN_ON(atomic_read(&asoc->rmem_alloc));
 
-	if (asoc->base.malloced) {
-		kfree(asoc);
-		SCTP_DBG_OBJCNT_DEC(assoc);
-	}
+	kfree(asoc);
+	SCTP_DBG_OBJCNT_DEC(assoc);
 }
 
 /* Change the primary destination address for the peer. */

net/sctp/endpointola.c

@@ -122,7 +122,6 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
 	/* Initialize the basic object fields. */
 	atomic_set(&ep->base.refcnt, 1);
 	ep->base.dead = 0;
-	ep->base.malloced = 1;
 
 	/* Create an input queue.  */
 	sctp_inq_init(&ep->base.inqueue);
@@ -198,7 +197,7 @@ struct sctp_endpoint *sctp_endpoint_new(struct sock *sk, gfp_t gfp)
 		goto fail;
 	if (!sctp_endpoint_init(ep, sk, gfp))
 		goto fail_init;
-	ep->base.malloced = 1;
+
 	SCTP_DBG_OBJCNT_INC(ep);
 	return ep;
 
@@ -279,11 +278,8 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
 	if (ep->base.sk)
 		sock_put(ep->base.sk);
 
-	/* Finally, free up our memory. */
-	if (ep->base.malloced) {
-		kfree(ep);
-		SCTP_DBG_OBJCNT_DEC(ep);
-	}
+	kfree(ep);
+	SCTP_DBG_OBJCNT_DEC(ep);
 }
 
 /* Hold a reference to an endpoint. */