linux-kernel - [PATCH net-next 08/19] rxrpc: Fix handling of connection failure in client call creation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <146729589947.26306.7039288680392775953.stgit@warthog.procyon.org.uk>
Date:	Thu, 30 Jun 2016 15:11:39 +0100
From:	David Howells <dhowells@...hat.com>
To:	davem@...emloft.net
Cc:	dhowells@...hat.com, netdev@...r.kernel.org,
	linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 08/19] rxrpc: Fix handling of connection failure in
 client call creation

If rxrpc_connect_call() fails during the creation of a client connection,
there are two bugs that we can hit that need fixing:

 (1) The call state should be moved to RXRPC_CALL_DEAD before the call
     cleanup phase is invoked.  If not, this can cause an assertion failure
     later.

 (2) call->link should be reinitialised after being deleted in
     rxrpc_new_client_call() - which otherwise leads to a failure later
     when the call cleanup attempts to delete the link again.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 net/rxrpc/call_object.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index ad933daae13b..6223a7ed831f 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -425,9 +425,10 @@ error:
 	rxrpc_put_call(call);
 
 	write_lock_bh(&rxrpc_call_lock);
-	list_del(&call->link);
+	list_del_init(&call->link);
 	write_unlock_bh(&rxrpc_call_lock);
 
+	call->state = RXRPC_CALL_DEAD;
 	rxrpc_put_call(call);
 	_leave(" = %d", ret);
 	return ERR_PTR(ret);
@@ -439,6 +440,7 @@ error:
 	 */
 found_user_ID_now_present:
 	write_unlock(&rx->call_lock);
+	call->state = RXRPC_CALL_DEAD;
 	rxrpc_put_call(call);
 	_leave(" = -EEXIST [%p]", call);
 	return ERR_PTR(-EEXIST);