From nobody Fri Sep 20 18:44:04 2024 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 45475C77B73 for ; Mon, 22 May 2023 02:21:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229825AbjEVCVS (ORCPT ); Sun, 21 May 2023 22:21:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58226 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229533AbjEVCVQ (ORCPT ); Sun, 21 May 2023 22:21:16 -0400 Received: from mailgw02.mediatek.com (unknown [210.61.82.184]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A99CE0; Sun, 21 May 2023 19:21:10 -0700 (PDT) X-UUID: 4d4bf402f84711edb20a276fd37b9834-20230522 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:Message-ID:Date:Subject:CC:To:From; bh=FvLKVHjka7cRO5KYMLXa5+eHvbBfffFIZp5h7B2yAEk=; b=TcV/Ri9xxnUaUP83Qn7Y1ZzndluR/EixtIH47azDWEN+1ygWO1vYjFGd8jyP2+VN8bw10JzOsFnW2WNoVy3KMJ0YJc70m2ShCyNZFOyRLrppV9Gxf+d1iD/njURPDtq8rMbmOkvtbyYwviKk/oFzlcijgw/QanefQp4EdeDdnew=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.25,REQID:4829c3d0-8688-464b-9f1f-121c397e69cc,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:d5b0ae3,CLOUDID:2b988a6c-2f20-4998-991c-3b78627e4938,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:11|1,File:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-UUID: 4d4bf402f84711edb20a276fd37b9834-20230522 Received: from mtkmbs11n1.mediatek.inc [(172.21.101.185)] by mailgw02.mediatek.com (envelope-from ) (Generic MTA with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 624682876; Mon, 22 May 2023 10:21:04 +0800 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs13n2.mediatek.inc (172.21.101.108) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Mon, 22 May 2023 10:21:03 +0800 Received: from mhfsdcap04.gcn.mediatek.inc (10.17.3.154) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Mon, 22 May 2023 10:21:02 +0800 From: Chunfeng Yun To: Greg Kroah-Hartman CC: Matthias Brugger , AngeloGioacchino Del Regno , Alan Stern , Chunfeng Yun , Prashanth K , Xiu Jianfeng , Christophe JAILLET , Fabrice Gasnier , Felipe Balbi , , , , , Kewu Chen , stable Subject: [PATCH] usb: gadget: u_serial: Add null pointer check in gserial_suspend Date: Mon, 22 May 2023 10:21:01 +0800 Message-ID: <20230522022101.32163-1-chunfeng.yun@mediatek.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-MTK: N Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When gserial_disconnect has already cleared gser->ioport, and the suspend triggers afterwards, gserial_suspend gets called, which will lead to accessing of gser->ioport and thus causing null pointer dereference. Add a null pointer check to prevent it as the bellow patch does: 5ec63fdbca60 ("usb: gadget: u_serial: Add null pointer check in gserial_res= ume") Fixes: aba3a8d01d62 ("usb: gadget: u_serial: add suspend resume callbacks") Cc: stable Signed-off-by: Chunfeng Yun --- drivers/usb/gadget/function/u_serial.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/fu= nction/u_serial.c index a0ca47fbff0f..40ba220cf6d2 100644 --- a/drivers/usb/gadget/function/u_serial.c +++ b/drivers/usb/gadget/function/u_serial.c @@ -1420,10 +1420,18 @@ EXPORT_SYMBOL_GPL(gserial_disconnect); =20 void gserial_suspend(struct gserial *gser) { - struct gs_port *port =3D gser->ioport; + struct gs_port *port; unsigned long flags; =20 - spin_lock_irqsave(&port->port_lock, flags); + spin_lock_irqsave(&serial_port_lock, flags); + port =3D gser->ioport; + if (!port) { + spin_unlock_irqrestore(&serial_port_lock, flags); + return; + } + + spin_lock(&port->port_lock); + spin_unlock(&serial_port_lock); port->suspended =3D true; spin_unlock_irqrestore(&port->port_lock, flags); } --=20 2.18.0