From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6C24CC4708F for ; Mon, 31 May 2021 14:23:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4E8CD613AE for ; Mon, 31 May 2021 14:23:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231838AbhEaOZS (ORCPT ); Mon, 31 May 2021 10:25:18 -0400 Received: from mail.kernel.org ([198.145.29.99]:48836 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232768AbhEaOXE (ORCPT ); Mon, 31 May 2021 10:23:04 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 840E96141E; Mon, 31 May 2021 13:45:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1622468733; bh=cmvl3lmxDmIROeHOoE0A5c/xC3Cp4aQM9DxioMsIpKk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Vf/AM1fO8GvhIOvrRsZ4sbdfzmgHSaE+33lhuEIPQVXdGjDU47RcqwKV8QgMG0v94 /KylkK4zzzhS7EX3dei4AWU4Dc22CfV4nM6T8qO7+Bre6gxieRHwSQSV3YF7gmvQU0 0ANJrCCb4gbebRPFp/YbAzRR+B9MWbqUjNj+w3mY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "David S. Miller" , Phillip Potter , Sasha Levin Subject: [PATCH 5.4 106/177] isdn: mISDN: correctly handle ph_info allocation failure in hfcsusb_ph_info Date: Mon, 31 May 2021 15:14:23 +0200 Message-Id: <20210531130651.569751086@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210531130647.887605866@linuxfoundation.org> References: <20210531130647.887605866@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Phillip Potter [ Upstream commit 5265db2ccc735e2783b790d6c19fb5cee8c025ed ] Modify return type of hfcusb_ph_info to int, so that we can pass error value up the call stack when allocation of ph_info fails. Also change three of four call sites to actually account for the memory failure. The fourth, in ph_state_nt, is infeasible to change as it is in turn called by ph_state which is used as a function pointer argument to mISDN_initdchannel, which would necessitate changing its signature and updating all the places where it is used (too many). Fixes original flawed commit (38d22659803a) from the University of Minnesota. Cc: David S. Miller Signed-off-by: Phillip Potter Link: https://lore.kernel.org/r/20210503115736.2104747-48-gregkh@linuxfoundation.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/isdn/hardware/mISDN/hfcsusb.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/drivers/isdn/hardware/mISDN/hfcsusb.c b/drivers/isdn/hardware/mISDN/hfcsusb.c index 7a051435c406..1f89378b5623 100644 --- a/drivers/isdn/hardware/mISDN/hfcsusb.c +++ b/drivers/isdn/hardware/mISDN/hfcsusb.c @@ -46,7 +46,7 @@ static void hfcsusb_start_endpoint(struct hfcsusb *hw, int channel); static void hfcsusb_stop_endpoint(struct hfcsusb *hw, int channel); static int hfcsusb_setup_bch(struct bchannel *bch, int protocol); static void deactivate_bchannel(struct bchannel *bch); -static void hfcsusb_ph_info(struct hfcsusb *hw); +static int hfcsusb_ph_info(struct hfcsusb *hw); /* start next background transfer for control channel */ static void @@ -241,7 +241,7 @@ hfcusb_l2l1B(struct mISDNchannel *ch, struct sk_buff *skb) * send full D/B channel status information * as MPH_INFORMATION_IND */ -static void +static int hfcsusb_ph_info(struct hfcsusb *hw) { struct ph_info *phi; @@ -249,6 +249,9 @@ hfcsusb_ph_info(struct hfcsusb *hw) int i; phi = kzalloc(struct_size(phi, bch, dch->dev.nrbchan), GFP_ATOMIC); + if (!phi) + return -ENOMEM; + phi->dch.ch.protocol = hw->protocol; phi->dch.ch.Flags = dch->Flags; phi->dch.state = dch->state; @@ -261,6 +264,8 @@ hfcsusb_ph_info(struct hfcsusb *hw) sizeof(struct ph_info_dch) + dch->dev.nrbchan * sizeof(struct ph_info_ch), phi, GFP_ATOMIC); kfree(phi); + + return 0; } /* @@ -345,8 +350,7 @@ hfcusb_l2l1D(struct mISDNchannel *ch, struct sk_buff *skb) ret = l1_event(dch->l1, hh->prim); break; case MPH_INFORMATION_REQ: - hfcsusb_ph_info(hw); - ret = 0; + ret = hfcsusb_ph_info(hw); break; } @@ -401,8 +405,7 @@ hfc_l1callback(struct dchannel *dch, u_int cmd) hw->name, __func__, cmd); return -1; } - hfcsusb_ph_info(hw); - return 0; + return hfcsusb_ph_info(hw); } static int @@ -744,8 +747,7 @@ hfcsusb_setup_bch(struct bchannel *bch, int protocol) handle_led(hw, (bch->nr == 1) ? LED_B1_OFF : LED_B2_OFF); } - hfcsusb_ph_info(hw); - return 0; + return hfcsusb_ph_info(hw); } static void -- 2.30.2