From patchwork Mon Feb 27 14:48:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: void0red X-Patchwork-Id: 13153756 X-Patchwork-Delegate: nbd@nbd.name 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 5F6E9C64ED6 for ; Mon, 27 Feb 2023 14:48:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229780AbjB0Osq (ORCPT ); Mon, 27 Feb 2023 09:48:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57534 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229737AbjB0Osn (ORCPT ); Mon, 27 Feb 2023 09:48:43 -0500 Received: from mail-pj1-x1035.google.com (mail-pj1-x1035.google.com [IPv6:2607:f8b0:4864:20::1035]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A9FA12040; Mon, 27 Feb 2023 06:48:31 -0800 (PST) Received: by mail-pj1-x1035.google.com with SMTP id gi3-20020a17090b110300b0023762f642dcso6360052pjb.4; Mon, 27 Feb 2023 06:48:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=SlgqotCFpMlYYZrIocsEAB0uv8GgACUTLIGeGd3Q3nk=; b=W2W0YyP4y0NIJfPvaCtZBWeQk8GAwmXaRT+2ZfOOLiZMs+olZ8CqkFui/R7U2PquAP 3xQHqbtYwMpNrKNdZLhwgnyjIWgIx3BILe5ZIOrK6c6ZPB5gE8bQj8BiUF49XmkRgDCp BgKnCXYSTZuEtiLEeOfUNu5C8/ahsUiBnOATSRuY858sOpQ7su9mVlxGIYoXiOEJBEl5 ANOCeovDzD66ND/3ozkLzS0PlESqKxagpkvFlug2/Kk+RIzp88bCgQjLGeN4aXfrBnNg Mree5WsvfetKz0CoXg3DtjUTtGc4xrwm0mu1wGOMXMA1XgbOYMAeVagEXV3E5aZMPKAB oFEw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=SlgqotCFpMlYYZrIocsEAB0uv8GgACUTLIGeGd3Q3nk=; b=J2ETYEiT9AyaPN/ONNj88E5wnkIHuuxNsNw9MCaMEsrSX7UDC5a++A7g3REaQTPbyD xCLlMAs4MsmOGfIPKyIe1Hkx5ejQC1xpTGaQQWbxGMkf1Xi5Lon1xXXPsRgrouLWw0Lf JKkSZPmHmsfmxJG8v4wwu6vHwolyHBf3Y5N3mYjEPeaCIOh46uRzGTpGQyNghJoI5jru gLc9P+SulInNO2okm+tiIocMkcgfEjwj0dbk+HnERMWuLRfuTy0kIfFm6eixAOlvZ+gh BcNHY4yILu+ReU5x3dcbqgby+FMQAHzI4fHlGAqou1JUCwQeb8PSk7Q1jdx7feWaysPg AlEg== X-Gm-Message-State: AO0yUKXYeFkDgK+qvRMGaOu6yNOjVWbN0xTVuFgyj8B6M/qI3/x4OjMu d8MoCPgFiPXLbWKNUS7tIk8= X-Google-Smtp-Source: AK7set9LjQIxiR8aWUSis2bKS9zBzibf4kvNlf9fsVaes9MFIMHBjmh+r3AxWIbfww8saVxOIsNLvw== X-Received: by 2002:a17:90b:1c10:b0:230:fac8:d7e7 with SMTP id oc16-20020a17090b1c1000b00230fac8d7e7mr25520356pjb.2.1677509310988; Mon, 27 Feb 2023 06:48:30 -0800 (PST) Received: from localhost.localdomain ([103.116.245.58]) by smtp.gmail.com with ESMTPSA id v23-20020a17090ae99700b00234ba1cfacbsm4561131pjy.17.2023.02.27.06.48.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Feb 2023 06:48:30 -0800 (PST) From: void0red To: lorenzo.bianconi@redhat.com Cc: angelogioacchino.delregno@collabora.com, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, kvalo@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-wireless@vger.kernel.org, lorenzo@kernel.org, matthias.bgg@gmail.com, nbd@nbd.name, netdev@vger.kernel.org, pabeni@redhat.com, ryder.lee@mediatek.com, sean.wang@mediatek.com, shayne.chen@mediatek.com, void0red@gmail.com Subject: [PATCH v3] wifi: mt76: handle failure of vzalloc in mt7615_coredump_work Date: Mon, 27 Feb 2023 22:48:23 +0800 Message-Id: <20230227144823.947648-1-void0red@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Kang Chen vzalloc may fails, dump might be null and will cause illegal address access later. Link: https://lore.kernel.org/all/Y%2Fy5Asxw3T3m4jCw@lore-desk Fixes: d2bf7959d9c0 ("mt76: mt7663: introduce coredump support") Signed-off-by: Kang Chen Reviewed-by: Simon Horman --- v3 -> v2: fix bugs v2 -> v1: add Fixes tag drivers/net/wireless/mediatek/mt76/mt7615/mac.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c index a95602473..796768011 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7615/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7615/mac.c @@ -2380,7 +2380,7 @@ void mt7615_coredump_work(struct work_struct *work) break; skb_pull(skb, sizeof(struct mt7615_mcu_rxd)); - if (data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) { + if (!dump || data + skb->len - dump > MT76_CONNAC_COREDUMP_SZ) { dev_kfree_skb(skb); continue; } @@ -2390,6 +2390,8 @@ void mt7615_coredump_work(struct work_struct *work) dev_kfree_skb(skb); } - dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ, - GFP_KERNEL); + + if (dump) + dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ, + GFP_KERNEL); }