From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2806130E0DC; Sat, 30 May 2026 17:57:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163856; cv=none; b=bVu3BLIbnElhquQ5VHATU8CbxGBnHIt271tto/V3WMM82RrdfxlMfZMlX05m17PZH0XYF2+hdkO6dAluFFtq5sV7gDB/TDdbiH/SeYpnkXzzRfK+RaPCaNf3CgpsGPADU33w92iNwRsJmdDKyUaxC86cG7JdjB45wc4HBEX494E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780163856; c=relaxed/simple; bh=VuftIgEo+2vEWkN1umeY85h6tgEmtyb6Eu2+4yi6NQQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BWX9TIiROYn3zi+x6LZ4aSd5aXjyiXSRqO8o0bOMGQCJ1GqaJQg3ZDNacvq6vfzVL7+6iE6P3jSCDrtWfmlR2+RLUsNp0Q5DznbRPr8Opb8U3ATbjUVnC4p6Nba5khjLLWT8qcLXSyUh1KJgHL6Gw/Nb93xU7vkhz7+RD6p2AU0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=WT39R65X; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="WT39R65X" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6DB341F00893; Sat, 30 May 2026 17:57:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1780163855; bh=rcR0mTGCKO6k6ebQPg7TPxPvNd4JaYDX8/JMVrU7HUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=WT39R65Xjsatywcw8y6Q1OpSOPZXgzzK+dcxDbXnhcGTsf9SpS9++tdYZ3iQA/CNr oD30LpGgJaXJKPlnWlA/qPhl2erAFijejATMmNECQcm3fjri8HSKHoJBhAbfEInLll YiYJseGOVLxtS1NzKiOrbVwnqjuNR1adYDFiDLwE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dudu Lu , Bobby Eshleman , Luigi Leonardi , Stefano Garzarella , "Michael S. Tsirkin" , Paolo Abeni Subject: [PATCH 5.15 382/776] vsock/virtio: fix accept queue count leak on transport mismatch Date: Sat, 30 May 2026 18:01:36 +0200 Message-ID: <20260530160250.388961106@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260530160240.228940103@linuxfoundation.org> References: <20260530160240.228940103@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dudu Lu commit 52bcb57a4e8a0865a76c587c2451906342ae1b2d upstream. virtio_transport_recv_listen() calls sk_acceptq_added() before vsock_assign_transport(). If vsock_assign_transport() fails or selects a different transport, the error path returns without calling sk_acceptq_removed(), permanently incrementing sk_ack_backlog. After approximately backlog+1 such failures, sk_acceptq_is_full() returns true, causing the listener to reject all new connections. Fix by moving sk_acceptq_added() to after the transport validation, matching the pattern used by vmci_transport and hyperv_transport. Fixes: c0cfa2d8a788 ("vsock: add multi-transports support") Signed-off-by: Dudu Lu Reviewed-by: Bobby Eshleman Reviewed-by: Luigi Leonardi Reviewed-by: Stefano Garzarella Acked-by: Michael S. Tsirkin Link: https://patch.msgid.link/20260413131409.19022-1-phx0fer@gmail.com Signed-off-by: Paolo Abeni Signed-off-by: Luigi Leonardi Signed-off-by: Greg Kroah-Hartman --- net/vmw_vsock/virtio_transport_common.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) --- a/net/vmw_vsock/virtio_transport_common.c +++ b/net/vmw_vsock/virtio_transport_common.c @@ -1223,8 +1223,6 @@ virtio_transport_recv_listen(struct sock return -ENOMEM; } - sk_acceptq_added(sk); - lock_sock_nested(child, SINGLE_DEPTH_NESTING); child->sk_state = TCP_ESTABLISHED; @@ -1246,6 +1244,7 @@ virtio_transport_recv_listen(struct sock return ret; } + sk_acceptq_added(sk); if (virtio_transport_space_update(child, pkt)) child->sk_write_space(child);