From patchwork Wed Nov 24 14:37:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 12637013 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6EA7BC433F5 for ; Wed, 24 Nov 2021 14:38:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351927AbhKXOlI (ORCPT ); Wed, 24 Nov 2021 09:41:08 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:43682 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1351615AbhKXOlB (ORCPT ); Wed, 24 Nov 2021 09:41:01 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1637764670; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=v/0HJBxmnrpwlX0tB2lVxqG/MEc291G0md/VX7QbXe8=; b=DS635/TM770goc2x7FPzNp6zsICpykPtOIoZ0TtvIeN6QZgtq/9TpT1wfPx1oKOmviM1E2 QUYqZSN9DfGkP1tvgYp2tVKGydEDa+AanNplSjkxCYBn4GBUaZvKDN9B1Vm74bJMc3NNT5 jX6kmupyxhrFuFceC9Dsg7/KaJnR5wE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-566-PGhS75WRPSS2jXHQ1e2e0A-1; Wed, 24 Nov 2021 09:37:44 -0500 X-MC-Unique: PGhS75WRPSS2jXHQ1e2e0A-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C905483DD20; Wed, 24 Nov 2021 14:37:42 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.25]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6C73560854; Wed, 24 Nov 2021 14:37:41 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 2/2] rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer() From: David Howells To: Eiichi Tsukata Cc: Marc Dionne , linux-afs@lists.infradead.org, dhowells@redhat.com, kuba@kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Date: Wed, 24 Nov 2021 14:37:40 +0000 Message-ID: <163776466062.1844202.16759821367213247018.stgit@warthog.procyon.org.uk> In-Reply-To: <163776465314.1844202.9057900281265187616.stgit@warthog.procyon.org.uk> References: <163776465314.1844202.9057900281265187616.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Eiichi Tsukata Need to call rxrpc_put_local() for peer candidate before kfree() as it holds a ref to rxrpc_local. [DH: v2: Changed to abstract the peer freeing code out into a function] Fixes: 9ebeddef58c4 ("rxrpc: rxrpc_peer needs to hold a ref on the rxrpc_local record") Signed-off-by: Eiichi Tsukata Signed-off-by: David Howells cc: Marc Dionne cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/all/20211121041608.133740-2-eiichi.tsukata@nutanix.com/ # v1 Reviewed-by: Marc Dionne --- net/rxrpc/peer_object.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/net/rxrpc/peer_object.c b/net/rxrpc/peer_object.c index 68396d052052..0298fe2ad6d3 100644 --- a/net/rxrpc/peer_object.c +++ b/net/rxrpc/peer_object.c @@ -299,6 +299,12 @@ static struct rxrpc_peer *rxrpc_create_peer(struct rxrpc_sock *rx, return peer; } +static void rxrpc_free_peer(struct rxrpc_peer *peer) +{ + rxrpc_put_local(peer->local); + kfree_rcu(peer, rcu); +} + /* * Set up a new incoming peer. There shouldn't be any other matching peers * since we've already done a search in the list from the non-reentrant context @@ -365,7 +371,7 @@ struct rxrpc_peer *rxrpc_lookup_peer(struct rxrpc_sock *rx, spin_unlock_bh(&rxnet->peer_hash_lock); if (peer) - kfree(candidate); + rxrpc_free_peer(candidate); else peer = candidate; } @@ -420,8 +426,7 @@ static void __rxrpc_put_peer(struct rxrpc_peer *peer) list_del_init(&peer->keepalive_link); spin_unlock_bh(&rxnet->peer_hash_lock); - rxrpc_put_local(peer->local); - kfree_rcu(peer, rcu); + rxrpc_free_peer(peer); } /* @@ -457,8 +462,7 @@ void rxrpc_put_peer_locked(struct rxrpc_peer *peer) if (n == 0) { hash_del_rcu(&peer->hash_link); list_del_init(&peer->keepalive_link); - rxrpc_put_local(peer->local); - kfree_rcu(peer, rcu); + rxrpc_free_peer(peer); } }