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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 B16AEC3F353 for ; Thu, 27 Feb 2020 14:00:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7EA4921D7E for ; Thu, 27 Feb 2020 14:00:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582812039; bh=8FIpGAv38N3JOcE3mn8yy2om0YdEiQlkwbQpw79bDhg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=U4PQDm8LEjhfotwxW14d8L1H2A7HlVn/L1AwqeVyWlvqQcTAeDOrIUlHZ9qejD+hZ yQDDId8LzJOqH7nuWBfphlYUJ7eZ0M41orJqYPAITwtwiPsoKWC95FmCqQoagrc2zY eYTcpY9zVjk8qYwGOmkEoMN1Hc1oOA8oC3MFzsyQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732782AbgB0OAi (ORCPT ); Thu, 27 Feb 2020 09:00:38 -0500 Received: from mail.kernel.org ([198.145.29.99]:34028 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732597AbgB0OAe (ORCPT ); Thu, 27 Feb 2020 09:00:34 -0500 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 7A6AD2084E; Thu, 27 Feb 2020 14:00:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1582812033; bh=8FIpGAv38N3JOcE3mn8yy2om0YdEiQlkwbQpw79bDhg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ED9/qWF6i6kq5JdWIxRUhtenCgiwa2SMHlefBf6rdt8NxFi4MOwc5b2Fjd2f6cnG4 la35A2fFylehPqajGsYet0td+U79OyZ0D2+gPACciM2Vd6qdthzpeVdISrfN1vgDDY Wjg8OSdQoQhlso8uHIRS4R0LUZOo+5oK46h2j0rk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, kbuild test robot , Coly Li , Jens Axboe , Sasha Levin Subject: [PATCH 4.14 158/237] bcache: explicity type cast in bset_bkey_last() Date: Thu, 27 Feb 2020 14:36:12 +0100 Message-Id: <20200227132308.154857170@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200227132255.285644406@linuxfoundation.org> References: <20200227132255.285644406@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: Coly Li [ Upstream commit 7c02b0055f774ed9afb6e1c7724f33bf148ffdc0 ] In bset.h, macro bset_bkey_last() is defined as, bkey_idx((struct bkey *) (i)->d, (i)->keys) Parameter i can be variable type of data structure, the macro always works once the type of struct i has member 'd' and 'keys'. bset_bkey_last() is also used in macro csum_set() to calculate the checksum of a on-disk data structure. When csum_set() is used to calculate checksum of on-disk bcache super block, the parameter 'i' data type is struct cache_sb_disk. Inside struct cache_sb_disk (also in struct cache_sb) the member keys is __u16 type. But bkey_idx() expects unsigned int (a 32bit width), so there is problem when sending parameters via stack to call bkey_idx(). Sparse tool from Intel 0day kbuild system reports this incompatible problem. bkey_idx() is part of user space API, so the simplest fix is to cast the (i)->keys to unsigned int type in macro bset_bkey_last(). Reported-by: kbuild test robot Signed-off-by: Coly Li Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- drivers/md/bcache/bset.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/md/bcache/bset.h b/drivers/md/bcache/bset.h index 8d1964b472e7e..0bfde500af196 100644 --- a/drivers/md/bcache/bset.h +++ b/drivers/md/bcache/bset.h @@ -381,7 +381,8 @@ void bch_btree_keys_stats(struct btree_keys *, struct bset_stats *); /* Bkey utility code */ -#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, (i)->keys) +#define bset_bkey_last(i) bkey_idx((struct bkey *) (i)->d, \ + (unsigned int)(i)->keys) static inline struct bkey *bset_bkey_idx(struct bset *i, unsigned idx) { -- 2.20.1