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authorDaniel Borkmann <dborkman@redhat.com>2013-06-25 18:17:29 +0200
committerDavid S. Miller <davem@davemloft.net>2013-06-25 16:33:04 -0700
commit0a2fbac197441ebeafbbef09d4bbc0b5e73716d7 (patch)
tree34fe9f625e40bb5f175fcd1ed5af8e72ceb21a87 /net/sctp
parentb527fe693304d244b6103dc9f8a87150e71c29f7 (diff)
downloadlinux-0a2fbac197441ebeafbbef09d4bbc0b5e73716d7.tar.bz2
net: sctp: decouple cleaning some socket data from endpoint
Rather instead of having the endpoint clean the garbage from the socket, use a sk_destruct handler sctp_destruct_sock(), that does the job for that when there are no more references on the socket. At least do this for our crypto transform through crypto_free_hash() that is allocated when in listening state. Also, perform sctp_put_port() only when sk is valid. At a later point in time we can still determine if there's an option of placing this into sk_prot->unhash() or sctp_endpoint_free() without any races. For now, leave it in sctp_endpoint_destroy() though. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/endpointola.c19
-rw-r--r--net/sctp/socket.c16
2 files changed, 25 insertions, 10 deletions
diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index a8b26741c0af..b26999d508ba 100644
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -247,10 +247,9 @@ void sctp_endpoint_free(struct sctp_endpoint *ep)
/* Final destructor for endpoint. */
static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
{
- SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
+ struct sock *sk;
- /* Free up the HMAC transform. */
- crypto_free_hash(sctp_sk(ep->base.sk)->hmac);
+ SCTP_ASSERT(ep->base.dead, "Endpoint is not dead", return);
/* Free the digest buffer */
kfree(ep->digest);
@@ -271,13 +270,15 @@ static void sctp_endpoint_destroy(struct sctp_endpoint *ep)
memset(ep->secret_key, 0, sizeof(ep->secret_key));
- /* Remove and free the port */
- if (sctp_sk(ep->base.sk)->bind_hash)
- sctp_put_port(ep->base.sk);
-
/* Give up our hold on the sock. */
- if (ep->base.sk)
- sock_put(ep->base.sk);
+ sk = ep->base.sk;
+ if (sk != NULL) {
+ /* Remove and free the port */
+ if (sctp_sk(sk)->bind_hash)
+ sctp_put_port(sk);
+
+ sock_put(sk);
+ }
kfree(ep);
SCTP_DBG_OBJCNT_DEC(ep);
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 4c47e5578d71..ba9359c20c8a 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -93,6 +93,7 @@ static int sctp_wait_for_packet(struct sock * sk, int *err, long *timeo_p);
static int sctp_wait_for_connect(struct sctp_association *, long *timeo_p);
static int sctp_wait_for_accept(struct sock *sk, long timeo);
static void sctp_wait_for_close(struct sock *sk, long timeo);
+static void sctp_destruct_sock(struct sock *sk);
static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
union sctp_addr *addr, int len);
static int sctp_bindx_add(struct sock *, struct sockaddr *, int);
@@ -3966,6 +3967,8 @@ static int sctp_init_sock(struct sock *sk)
sp->hmac = NULL;
+ sk->sk_destruct = sctp_destruct_sock;
+
SCTP_DBG_OBJCNT_INC(sock);
local_bh_disable();
@@ -4008,6 +4011,17 @@ static void sctp_destroy_sock(struct sock *sk)
local_bh_enable();
}
+/* Triggered when there are no references on the socket anymore */
+static void sctp_destruct_sock(struct sock *sk)
+{
+ struct sctp_sock *sp = sctp_sk(sk);
+
+ /* Free up the HMAC transform. */
+ crypto_free_hash(sp->hmac);
+
+ inet_sock_destruct(sk);
+}
+
/* API 4.1.7 shutdown() - TCP Style Syntax
* int shutdown(int socket, int how);
*
@@ -6848,7 +6862,7 @@ void sctp_copy_sock(struct sock *newsk, struct sock *sk,
newsk->sk_reuse = sk->sk_reuse;
newsk->sk_shutdown = sk->sk_shutdown;
- newsk->sk_destruct = inet_sock_destruct;
+ newsk->sk_destruct = sctp_destruct_sock;
newsk->sk_family = sk->sk_family;
newsk->sk_protocol = IPPROTO_SCTP;
newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;