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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 8C988C433E0 for ; Tue, 16 Jun 2020 16:09:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70FD9208D5 for ; Tue, 16 Jun 2020 16:09:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592323794; bh=UGvNsIBI77475V/aFFDuzHClccitPkM+H/tfhf9NUJ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Hau7iQvH20fc0+tB1tYu/yYstLHrF4QToOlB3WtXtfHLWujvq6sJRUc+dNZ3GSt1y q+rNmRq4G0a/QTihGmVj6xN2AjWIpLvhba/19G2Hj4ZIE6rkV0gsN91LpXwLsJn/kc whdxJRiWwIOaAMniPO70UmZe/4GZdle1F7VthQIE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732050AbgFPPpK (ORCPT ); Tue, 16 Jun 2020 11:45:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:35982 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732014AbgFPPpE (ORCPT ); Tue, 16 Jun 2020 11:45:04 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 103F6214F1; Tue, 16 Jun 2020 15:45:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592322303; bh=UGvNsIBI77475V/aFFDuzHClccitPkM+H/tfhf9NUJ4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WFs1JyMW+Lj5qvjgW6+hud1sP1k7MZLDXp9kxh64nfPa/NCVRTwNDhcMKxudgfuU2 NbWPywI44B5nAJmc2ZTPTr+FH/6DhIAVWff81B+H+4E0qKZBvNEX1FezKxBQaRv6TS KsZQmr1GhVhq8w9/JBWZMclmUj5hTp+oDXVn5YtE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Gordeev , Andy Shevchenko , Andrew Morton , Andy Shevchenko , Yury Norov , Amritha Nambiar , Arnaldo Carvalho de Melo , Chris Wilson , Kees Cook , Matthew Wilcox , Miklos Szeredi , Rasmus Villemoes , Steffen Klassert , "Tobin C . Harding" , Vineet Gupta , Will Deacon , Willem de Bruijn , Linus Torvalds Subject: [PATCH 5.7 079/163] lib: fix bitmap_parse() on 64-bit big endian archs Date: Tue, 16 Jun 2020 17:34:13 +0200 Message-Id: <20200616153110.626629451@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200616153106.849127260@linuxfoundation.org> References: <20200616153106.849127260@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexander Gordeev commit 81c4f4d924d5d009b5ed785a3e22b18d0f7b831f upstream. Commit 2d6261583be0 ("lib: rework bitmap_parse()") does not take into account order of halfwords on 64-bit big endian architectures. As result (at least) Receive Packet Steering, IRQ affinity masks and runtime kernel test "test_bitmap" get broken on s390. [andriy.shevchenko@linux.intel.com: convert infinite while loop to a for loop] Link: http://lkml.kernel.org/r/20200609140535.87160-1-andriy.shevchenko@linux.intel.com Fixes: 2d6261583be0 ("lib: rework bitmap_parse()") Signed-off-by: Alexander Gordeev Signed-off-by: Andy Shevchenko Signed-off-by: Andrew Morton Reviewed-by: Andy Shevchenko Cc: Yury Norov Cc: Amritha Nambiar Cc: Arnaldo Carvalho de Melo Cc: Chris Wilson Cc: Kees Cook Cc: Matthew Wilcox Cc: Miklos Szeredi Cc: Rasmus Villemoes Cc: Steffen Klassert Cc: "Tobin C . Harding" Cc: Vineet Gupta Cc: Will Deacon Cc: Willem de Bruijn Cc: Link: http://lkml.kernel.org/r/1591634471-17647-1-git-send-email-agordeev@linux.ibm.com Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- lib/bitmap.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) --- a/lib/bitmap.c +++ b/lib/bitmap.c @@ -740,8 +740,9 @@ int bitmap_parse(const char *start, unsi int chunks = BITS_TO_U32(nmaskbits); u32 *bitmap = (u32 *)maskp; int unset_bit; + int chunk; - while (1) { + for (chunk = 0; ; chunk++) { end = bitmap_find_region_reverse(start, end); if (start > end) break; @@ -749,7 +750,11 @@ int bitmap_parse(const char *start, unsi if (!chunks--) return -EOVERFLOW; - end = bitmap_get_x32_reverse(start, end, bitmap++); +#if defined(CONFIG_64BIT) && defined(__BIG_ENDIAN) + end = bitmap_get_x32_reverse(start, end, &bitmap[chunk ^ 1]); +#else + end = bitmap_get_x32_reverse(start, end, &bitmap[chunk]); +#endif if (IS_ERR(end)) return PTR_ERR(end); }