From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.10]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2DAB71CB329; Thu, 22 Aug 2024 14:49:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.10 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724338157; cv=none; b=FLTvfjunWzeuKw+2Q/aFXCDMxcK3BgRRMq6gD7wewKSBN/x3jKZG5t76TqcaTDCZpayAr6KP4dkSxHP6Gd551LilJ4VSqlUZ56wI9wmSw1/q2KoxaSU3LCJKILlqm8qFy6rtYxN7yLkVLmoqkmkJ58aRHZ6AAH8XvYHxVmehgto= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724338157; c=relaxed/simple; bh=nVK+LNj/wLjL3hrAoZDtwBy0ZOqxtsuaS1tXN9NmzRI=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lYLuQk/2Vc6pKB1QoIQIp9DPbSrLv+euZ3PQFfIOKmjPRM7uJSz14nhCipeq19SPJ7xPg5tNDDqkap05qdDRE/6Z10Fol0CP3n+9ggSUpYn30F2/2OmbrwVL/6E0xx3ZMwyukG3x2b1AJahmJ3t52MWFQ5WgUYdjRxQFrIyeghU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=kernel.org; spf=fail smtp.mailfrom=kernel.org; arc=none smtp.client-ip=198.175.65.10 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=kernel.org Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=kernel.org X-CSE-ConnectionGUID: pzV1vKq4Qr6rtl1LW4fXSg== X-CSE-MsgGUID: aKPHNV+BRgeiJY8t1f0JqQ== X-IronPort-AV: E=McAfee;i="6700,10204,11172"; a="40221801" X-IronPort-AV: E=Sophos;i="6.10,167,1719903600"; d="scan'208";a="40221801" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2024 07:48:23 -0700 X-CSE-ConnectionGUID: UdIrjZhCSFGc6ouMiWWcLQ== X-CSE-MsgGUID: FsVdg77kTMeRpXd6tbM6Zw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,167,1719903600"; d="scan'208";a="61793671" Received: from smile.fi.intel.com ([10.237.72.54]) by orviesa006.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2024 07:48:14 -0700 Received: from andy by smile.fi.intel.com with local (Exim 4.98) (envelope-from ) id 1sh96C-00000000U7b-2aUU; Thu, 22 Aug 2024 17:47:40 +0300 Date: Thu, 22 Aug 2024 17:47:40 +0300 From: Andy Shevchenko To: Philipp Stanner Cc: Jonathan Corbet , Jens Axboe , Wu Hao , Tom Rix , Moritz Fischer , Xu Yilun , Linus Walleij , Bartosz Golaszewski , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Alexandre Torgue , Jose Abreu , Maxime Coquelin , Bjorn Helgaas , Alvaro Karsz , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , Richard Cochran , Mark Brown , David Lechner , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , Damien Le Moal , Hannes Reinecke , Chaitanya Kulkarni , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-fpga@vger.kernel.org, linux-gpio@vger.kernel.org, netdev@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, virtualization@lists.linux.dev, stable@vger.kernel.org, Christophe JAILLET Subject: Re: [PATCH v3 7/9] vdpa: solidrun: Fix UB bug with devres Message-ID: References: <20240822134744.44919-1-pstanner@redhat.com> <20240822134744.44919-8-pstanner@redhat.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20240822134744.44919-8-pstanner@redhat.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo On Thu, Aug 22, 2024 at 03:47:39PM +0200, Philipp Stanner wrote: > In psnet_open_pf_bar() and snet_open_vf_bar() a string later passed to > pcim_iomap_regions() is placed on the stack. Neither > pcim_iomap_regions() nor the functions it calls copy that string. > > Should the string later ever be used, this, consequently, causes > undefined behavior since the stack frame will by then have disappeared. > > Fix the bug by allocating the strings on the heap through > devm_kasprintf(). ... > - snprintf(name, sizeof(name), "psnet[%s]-bars", pci_name(pdev)); > + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-bars", pci_name(pdev)); > + if (!name) > + return -ENOMEM; > + > ret = pcim_iomap_regions(pdev, mask, name); ... > - snprintf(name, sizeof(name), "snet[%s]-bar", pci_name(pdev)); > + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "psnet[%s]-bars", pci_name(pdev)); > + if (!name) > + return -ENOMEM; + Blank line as in the above snippet? > /* Request and map BAR */ > ret = pcim_iomap_regions(pdev, BIT(snet->psnet->cfg.vf_bar), name); -- With Best Regards, Andy Shevchenko