From patchwork Sat Jun 20 03:29:55 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kees Cook X-Patchwork-Id: 11615431 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 529F760D for ; Sat, 20 Jun 2020 03:30:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 38FF322513 for ; Sat, 20 Jun 2020 03:30:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="AtmMokfE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732722AbgFTDad (ORCPT ); Fri, 19 Jun 2020 23:30:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58238 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732777AbgFTDaY (ORCPT ); Fri, 19 Jun 2020 23:30:24 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B77CAC061371 for ; Fri, 19 Jun 2020 20:30:19 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id s88so5282369pjb.5 for ; Fri, 19 Jun 2020 20:30:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=YYIu82vaLERDRRVNezIsYro3B9HeZTQxC/aBbKcbPE4=; b=AtmMokfEBFiCVkYDMGVHGJuJS9fKp3FifwZogKQ2q6x4hzDovnsRDnERm9pIhMX5VI ToWY1NArXw8XqplWnXUVi18xafByHCkKQ3jNMc0A7Q42LSaPw/Owem45vKA8WDI8WLVz orkNoFzi4U8cu25M9SMeU7hdywlADX44zclAo= 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=YYIu82vaLERDRRVNezIsYro3B9HeZTQxC/aBbKcbPE4=; b=TqM+FYwV1FRSHy+wfw6QipCpqxuICQk+YeDbq6vxlhZ4EBQqyraBRA7gT8kn/gIeze aH5GnAcLIRSMUhLB05429lFvFgYcGZiDSjnfwWJqVxOZNwAR9B7XrQUlRY2RSlTDDMNt 9ulmD1ON0kcL0oebtrO/AD3sfLaWUj1xzBHkxtVf3bXBVRh18fGDuHD8DtkpkwHdCgBP Sqlubge6iE2eh8ibtzUOjuyotiIUAV5I1PukMfyK8rEv5TPlsxxojiidKA61hKbjKxIi w/DzkIP8kvdfA4Qdk3AH1YgpAwDImhYn4nLaIPf9R39GwfIB2kT83jCagcHzvKDGdbsA 6PeA== X-Gm-Message-State: AOAM532h36QSfvIK5PYkETC0FQ+9RMX3efl/roMJ9hnwCEmFp3gWI78m 1QoHnlHCfV5Y2F46e58n+AHr2w== X-Google-Smtp-Source: ABdhPJzr2vJct8/WkWUzne3Cmk1hS4+0nx/CV5ignmOUO6jPnss1JMiZ2KbcObWfeGsMcluI2vysoA== X-Received: by 2002:a17:90a:d244:: with SMTP id o4mr6477083pjw.186.1592623819315; Fri, 19 Jun 2020 20:30:19 -0700 (PDT) Received: from www.outflux.net (smtp.outflux.net. [198.145.64.163]) by smtp.gmail.com with ESMTPSA id u14sm7848572pfk.211.2020.06.19.20.30.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Jun 2020 20:30:17 -0700 (PDT) From: Kees Cook To: linux-kernel@vger.kernel.org Cc: Kees Cook , Linus Torvalds , Miguel Ojeda , Alexander Potapenko , Joe Perches , Andy Whitcroft , x86@kernel.org, drbd-dev@lists.linbit.com, linux-block@vger.kernel.org, b43-dev@lists.infradead.org, netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-wireless@vger.kernel.org, linux-ide@vger.kernel.org, linux-clk@vger.kernel.org, linux-spi@vger.kernel.org, linux-mm@kvack.org, clang-built-linux@googlegroups.com Subject: [PATCH v2 04/16] b43: Remove uninitialized_var() usage Date: Fri, 19 Jun 2020 20:29:55 -0700 Message-Id: <20200620033007.1444705-5-keescook@chromium.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200620033007.1444705-1-keescook@chromium.org> References: <20200620033007.1444705-1-keescook@chromium.org> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Using uninitialized_var() is dangerous as it papers over real bugs[1] (or can in the future), and suppresses unrelated compiler warnings (e.g. "unused variable"). If the compiler thinks it is uninitialized, either simply initialize the variable or make compiler changes. As a precursor to removing[2] this[3] macro[4], just initialize this variable to NULL. No later NULL deref is possible due to the early returns outside of the (phy->rev >= 7 && phy->rev < 19) case, which explicitly tests for NULL. [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@google.com/ [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ Fixes: 58619b14d106 ("b43: move under broadcom vendor directory") Signed-off-by: Kees Cook Reviewed-by: Nick Desaulniers --- drivers/net/wireless/broadcom/b43/phy_n.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/broadcom/b43/phy_n.c b/drivers/net/wireless/broadcom/b43/phy_n.c index c33b4235839d..46db91846007 100644 --- a/drivers/net/wireless/broadcom/b43/phy_n.c +++ b/drivers/net/wireless/broadcom/b43/phy_n.c @@ -4222,7 +4222,7 @@ static void b43_nphy_tx_gain_table_upload(struct b43_wldev *dev) u32 rfpwr_offset; u8 pga_gain, pad_gain; int i; - const s16 *uninitialized_var(rf_pwr_offset_table); + const s16 *rf_pwr_offset_table = NULL; table = b43_nphy_get_tx_gain_table(dev); if (!table)