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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 0BC9CC433B4 for ; Wed, 21 Apr 2021 18:48:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CFBED6144D for ; Wed, 21 Apr 2021 18:48:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S245283AbhDUSsg (ORCPT ); Wed, 21 Apr 2021 14:48:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59136 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235269AbhDUSsa (ORCPT ); Wed, 21 Apr 2021 14:48:30 -0400 Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 76390C06174A; Wed, 21 Apr 2021 11:47:55 -0700 (PDT) Received: by mail-pg1-x529.google.com with SMTP id z16so30755867pga.1; Wed, 21 Apr 2021 11:47:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=DWlEjhkosbdFJdYkdgHRxg+yCz/Y2VdtjDbfu98fJME=; b=RTudUTdt4NdhTTPWpDKzroN4k3kseztpxFb12/BidKZoGQLOHFhwaS1nFkiptN3jHM suhL5SGE8/1h2fENqyWk0Wfj5jsRzxlnnLF7WeEDL7nou4Vu36ewAcOpOqERGZsjOkqn WmfYTL2ORIfPyNy8J1m7jXEs49lG+uu9l2HYAcxgHHnr2Gx3qM93nnwjU9+tI8/DdMKB 6s8zY+cewFB9T5/H1mXn7htez4ZqS1EsNKzN+Z8PquS1a7VbOGt448oQgac9c+rhGO3q OyQXWHWih7YNQP/a0XGSeyqctR8R4yzdBdJOpIDNBV4CkbAPOR+b0u+JxJHfYc6iDfdw AnBA== 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:mime-version :content-transfer-encoding; bh=DWlEjhkosbdFJdYkdgHRxg+yCz/Y2VdtjDbfu98fJME=; b=dsU+I5htOc2coc3t86Bg1eAr6hxH58dm98pOBCNqufa/HUM7QV1fCgZRASU2BzyR/W SQILLeZTFWM0rwfX0gnBtZS5uiUDi4gwyxDtiGnjtG8WAnlBLiLpMgIXHNRqjEFYpHmn wee46G5TlvjthSEASe+jvOQFTZD+C51IaxCPBTLkgqX90PHI+/jcrSJEON9PVJcEA9Wn TAyiJ6sfUcB0q/y4iMPy5NS9X78/YbEMSpgrDx2qcj2r+1Mkx6aA36Clkfs0txUMvWea AXT2quclwMRs/Irrbg8xvoQzymkZzG/rBmw6jsGqmk/PIU4wwnnwCt2t4N5Vc9JLSAY7 SwfA== X-Gm-Message-State: AOAM5336S7HaCQgiX28uMOAuWtfZW+eTZDHwSxK3apga7SOLqC+KyB3N wkgp7UqnXK6JWZm8YNY+/ew= X-Google-Smtp-Source: ABdhPJw5vA7JuDNxmfeHwrsHzCzvymLS1RLRp08ylnm9bGF6jx2hE7UC2TSO2qCYFuT3QToT/ioqng== X-Received: by 2002:a65:590a:: with SMTP id f10mr23139755pgu.358.1619030874900; Wed, 21 Apr 2021 11:47:54 -0700 (PDT) Received: from localhost.localdomain ([103.248.31.176]) by smtp.googlemail.com with ESMTPSA id x22sm142542pgx.19.2021.04.21.11.47.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Apr 2021 11:47:54 -0700 (PDT) From: Amey Narkhede To: Bjorn Helgaas Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Amey Narkhede Subject: [PATCH] PCI: Check value of resource alignment before using __ffs Date: Thu, 22 Apr 2021 00:17:47 +0530 Message-Id: <20210421184747.62391-1-ameynarkhede03@gmail.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return value of __ffs is undefined if no set bit exists in its argument. This indicates that the associated BAR has invalid alignment. Signed-off-by: Amey Narkhede --- drivers/pci/setup-bus.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 2ce636937c6e..44e8449418ae 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1044,6 +1044,11 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, * resources. */ align = pci_resource_alignment(dev, r); + if (!align) { + pci_warn(dev, "BAR %d: %pR has bogus alignment\n", + i, r); + continue; + } order = __ffs(align) - 20; if (order < 0) order = 0; -- 2.31.1