From patchwork Fri Feb 17 13:24:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Natalia Petrova X-Patchwork-Id: 655315 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 DE08BC636D4 for ; Fri, 17 Feb 2023 13:24:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229705AbjBQNYl (ORCPT ); Fri, 17 Feb 2023 08:24:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47492 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229436AbjBQNYk (ORCPT ); Fri, 17 Feb 2023 08:24:40 -0500 Received: from exchange.fintech.ru (e10edge.fintech.ru [195.54.195.159]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 35C2267452; Fri, 17 Feb 2023 05:24:36 -0800 (PST) Received: from Ex16-01.fintech.ru (10.0.10.18) by exchange.fintech.ru (195.54.195.159) with Microsoft SMTP Server (TLS) id 14.3.498.0; Fri, 17 Feb 2023 16:24:34 +0300 Received: from KANASHIN1.fintech.ru (10.0.253.125) by Ex16-01.fintech.ru (10.0.10.18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2242.4; Fri, 17 Feb 2023 16:24:34 +0300 From: Natalia Petrova To: Andreas Noever CC: Natalia Petrova , Michael Jamet , Mika Westerberg , Yehezkel Bernat , , , Subject: [PATCH] thunderbolt_tb: add check for return value of 'tb_switch_find_port' Date: Fri, 17 Feb 2023 16:24:32 +0300 Message-ID: <20230217132432.487106-1-n.petrova@fintech.ru> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Originating-IP: [10.0.253.125] X-ClientProxiedBy: Ex16-01.fintech.ru (10.0.10.18) To Ex16-01.fintech.ru (10.0.10.18) Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Return value of 'tb_switch_find_port' has to be checked to avoid null pointer dereferences in functions tb_tunnel_alloc_dma() and tb_port_info(). Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 386e5e29d81c ("thunderbolt: Make tb_find_port() available to other files") Signed-off-by: Natalia Petrova --- drivers/thunderbolt/tb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c index 9853f6c7e81d..5d6cded68d46 100644 --- a/drivers/thunderbolt/tb.c +++ b/drivers/thunderbolt/tb.c @@ -1156,6 +1156,8 @@ static int tb_approve_xdomain_paths(struct tb *tb, struct tb_xdomain *xd, sw = tb_to_switch(xd->dev.parent); dst_port = tb_port_at(xd->route, sw); nhi_port = tb_switch_find_port(tb->root_switch, TB_TYPE_NHI); + if (!nhi_port) + return -EIO; mutex_lock(&tb->lock); tunnel = tb_tunnel_alloc_dma(tb, nhi_port, dst_port, transmit_path,