From patchwork Wed Apr 22 11:19:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 226993 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=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 0696DC55189 for ; Wed, 22 Apr 2020 11:20:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D3B5620781 for ; Wed, 22 Apr 2020 11:20:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="SNCDgQQS" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726809AbgDVLU1 (ORCPT ); Wed, 22 Apr 2020 07:20:27 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44384 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726823AbgDVLU1 (ORCPT ); Wed, 22 Apr 2020 07:20:27 -0400 Received: from mail-wm1-x341.google.com (mail-wm1-x341.google.com [IPv6:2a00:1450:4864:20::341]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9DCDCC03C1A8 for ; Wed, 22 Apr 2020 04:20:26 -0700 (PDT) Received: by mail-wm1-x341.google.com with SMTP id z6so1906346wml.2 for ; Wed, 22 Apr 2020 04:20:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=s6FBZN4nRWiUrKVfoyflfqov+eXkWkgr9+0BkVt9Xfw=; b=SNCDgQQSWnhbVmxsp2SUWQDXfWmKAKUCqYlH37OSG2GjCddZbx6pjZHJoR/zKwiXl3 VXD1trZnXN5R6s/GBw2utMT16tz4hDBo42RkeoSlmKOLaURzkZDhrDkyE1KrDGZE61TE boV7LNASYDMOc9qzEeqpeZqKS2gNpTVkZu9avEGRaNBYfirFGMKPwguetTebXGFtz6oq CCFnaIFipBnJR4y6VjciTo6wi83Hx1g5OgZ+w8fMiQ/ObvVTohcrq7KL4aQhZtGDX4xU ONHYe2+JwGObuRXLea4Qx+IhGNjBPqzTN2YWYHW14qPpgnH+31Czse2oy3aF9EzSufbI jvXg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=s6FBZN4nRWiUrKVfoyflfqov+eXkWkgr9+0BkVt9Xfw=; b=DCFNbovNbpz9MTdc0kolvUp1pNtZ2WDsuM+H4o3zL4bwnKyULgaSVyoLZthYSkxJBL pwkbtVpuMbb2qe6N/LaUnkrTpLQpZLDq/RXF6B9ftngzBcaBwYG3rxy441R8NMxQlOXA Q1jUfryqd4b/1rp7pYe4Npgu8lW6OEAJk5936qstiphPcR7oDF5M1JMpI2kGolu9RYm1 XwpFWLI7bD4ZPcagoB5hVMuhLQCdN328HhvOCFkP5+WG8mobF/cCnq8U5Kl53OtO4BnC Fh9FFheIhErB/eRnF+knmFPCVEAXFmmYLt3QFqVKyXfnbobrgEgMNNIqFnKGrg8GDgeQ Q1dg== X-Gm-Message-State: AGi0PuYUuGz8zuQqH70a0pDzrZEbmCpfnMqjLU+4HCNkjk2/n9hJelYZ 2SsWrhEZqzKFxzUOtk2uaD2aF6NzQI4= X-Google-Smtp-Source: APiQypJiSNueVF1MFbf9oF7n6fiH7FXvVDeBnyk0r3WiMSTOjnA198jAg/NPHqXAwKi26uiQgCHqUQ== X-Received: by 2002:a1c:c2d4:: with SMTP id s203mr10752049wmf.128.1587554424942; Wed, 22 Apr 2020 04:20:24 -0700 (PDT) Received: from localhost.localdomain ([2.31.163.63]) by smtp.gmail.com with ESMTPSA id n6sm8247255wrs.81.2020.04.22.04.20.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 22 Apr 2020 04:20:23 -0700 (PDT) From: Lee Jones To: stable@vger.kernel.org Cc: Lior David , Maya Erez , Kalle Valo , Lee Jones Subject: [PATCH 4.9 17/21] wil6210: fix length check in __wmi_send Date: Wed, 22 Apr 2020 12:19:53 +0100 Message-Id: <20200422111957.569589-18-lee.jones@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200422111957.569589-1-lee.jones@linaro.org> References: <20200422111957.569589-1-lee.jones@linaro.org> MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lior David [ Upstream commit 26a6d5274865532502c682ff378ac8ebe2886238 ] The current length check: sizeof(cmd) + len > r->entry_size will allow very large values of len (> U16_MAX - sizeof(cmd)) and can cause a buffer overflow. Fix the check to cover this case. In addition, ensure the mailbox entry_size is not too small, since this can also bypass the above check. Signed-off-by: Lior David Signed-off-by: Maya Erez Signed-off-by: Kalle Valo Signed-off-by: Lee Jones --- drivers/net/wireless/ath/wil6210/interrupt.c | 22 +++++++++++++++++++- drivers/net/wireless/ath/wil6210/wmi.c | 2 +- 2 files changed, 22 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/ath/wil6210/interrupt.c b/drivers/net/wireless/ath/wil6210/interrupt.c index 64046e0bd0a22..a37533cffc7ca 100644 --- a/drivers/net/wireless/ath/wil6210/interrupt.c +++ b/drivers/net/wireless/ath/wil6210/interrupt.c @@ -356,6 +356,25 @@ static void wil_cache_mbox_regs(struct wil6210_priv *wil) wil_mbox_ring_le2cpus(&wil->mbox_ctl.tx); } +static bool wil_validate_mbox_regs(struct wil6210_priv *wil) +{ + size_t min_size = sizeof(struct wil6210_mbox_hdr) + + sizeof(struct wmi_cmd_hdr); + + if (wil->mbox_ctl.rx.entry_size < min_size) { + wil_err(wil, "rx mbox entry too small (%d)\n", + wil->mbox_ctl.rx.entry_size); + return false; + } + if (wil->mbox_ctl.tx.entry_size < min_size) { + wil_err(wil, "tx mbox entry too small (%d)\n", + wil->mbox_ctl.tx.entry_size); + return false; + } + + return true; +} + static irqreturn_t wil6210_irq_misc(int irq, void *cookie) { struct wil6210_priv *wil = cookie; @@ -391,7 +410,8 @@ static irqreturn_t wil6210_irq_misc(int irq, void *cookie) if (isr & ISR_MISC_FW_READY) { wil_dbg_irq(wil, "IRQ: FW ready\n"); wil_cache_mbox_regs(wil); - set_bit(wil_status_mbox_ready, wil->status); + if (wil_validate_mbox_regs(wil)) + set_bit(wil_status_mbox_ready, wil->status); /** * Actual FW ready indicated by the * WMI_FW_READY_EVENTID diff --git a/drivers/net/wireless/ath/wil6210/wmi.c b/drivers/net/wireless/ath/wil6210/wmi.c index 61419d1b45435..3f6ac1ca0e575 100644 --- a/drivers/net/wireless/ath/wil6210/wmi.c +++ b/drivers/net/wireless/ath/wil6210/wmi.c @@ -209,7 +209,7 @@ static int __wmi_send(struct wil6210_priv *wil, u16 cmdid, void *buf, u16 len) uint retry; int rc = 0; - if (sizeof(cmd) + len > r->entry_size) { + if (len > r->entry_size - sizeof(cmd)) { wil_err(wil, "WMI size too large: %d bytes, max is %d\n", (int)(sizeof(cmd) + len), r->entry_size); return -ERANGE;