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=-24.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,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 90388C47E48 for ; Wed, 14 Jul 2021 19:52:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7F31B613C3 for ; Wed, 14 Jul 2021 19:52:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241751AbhGNTyl (ORCPT ); Wed, 14 Jul 2021 15:54:41 -0400 Received: from mail.kernel.org ([198.145.29.99]:46240 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240287AbhGNTti (ORCPT ); Wed, 14 Jul 2021 15:49:38 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1835A613F0; Wed, 14 Jul 2021 19:44:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1626291898; bh=3nQWxeAB87beCZKNA4PKkDHoR1yS12Zk9pLhwBjaa5I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QdXKg65oGzhhBhW9suvE+40znz2N1BlkcdpkEP3OBsDLrCpdR/btodMCOjiujtvMi oRVTAIVl85x5nxAt8HUrwp47Fe12OLCHSEHpc5tsU5xgqtXEPNlyZKVGPOlm1UG+1v VKReV8OZBAKN68DIMmvxOQRIY6x79uAljeahzbjpbU7XnTAzfosXfV8hU1sPDbm4Y5 wvswiwreE7UJvJ3bTYNrJn0AHPMmL+rmdecqHBMJY5zlieSDoC1vgci4ok7h8gj120 gehXLzrK6AdqkMvtJbEZMhGwgUngGQoxCAnD2P/Ith1QJUdy8dFFJ+HfFvk7xZrWFZ qTAICr0ll0O7g== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Colin Ian King , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 78/88] scsi: aic7xxx: Fix unintentional sign extension issue on left shift of u8 Date: Wed, 14 Jul 2021 15:42:53 -0400 Message-Id: <20210714194303.54028-78-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210714194303.54028-1-sashal@kernel.org> References: <20210714194303.54028-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King [ Upstream commit 332a9dd1d86f1e7203fc7f0fd7e82f0b304200fe ] The shifting of the u8 integer returned fom ahc_inb(ahc, port+3) by 24 bits to the left will be promoted to a 32 bit signed int and then sign-extended to a u64. In the event that the top bit of the u8 is set then all then all the upper 32 bits of the u64 end up as also being set because of the sign-extension. Fix this by casting the u8 values to a u64 before the 24 bit left shift. [ This dates back to 2002, I found the offending commit from the git history git://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git, commit f58eb66c0b0a ("Update aic7xxx driver to 6.2.10...") ] Link: https://lore.kernel.org/r/20210621151727.20667-1-colin.king@canonical.com Signed-off-by: Colin Ian King Signed-off-by: Martin K. Petersen Addresses-Coverity: ("Unintended sign extension") Signed-off-by: Sasha Levin --- drivers/scsi/aic7xxx/aic7xxx_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/scsi/aic7xxx/aic7xxx_core.c b/drivers/scsi/aic7xxx/aic7xxx_core.c index 725bb7f58054..12fed15dec66 100644 --- a/drivers/scsi/aic7xxx/aic7xxx_core.c +++ b/drivers/scsi/aic7xxx/aic7xxx_core.c @@ -493,7 +493,7 @@ ahc_inq(struct ahc_softc *ahc, u_int port) return ((ahc_inb(ahc, port)) | (ahc_inb(ahc, port+1) << 8) | (ahc_inb(ahc, port+2) << 16) - | (ahc_inb(ahc, port+3) << 24) + | (((uint64_t)ahc_inb(ahc, port+3)) << 24) | (((uint64_t)ahc_inb(ahc, port+4)) << 32) | (((uint64_t)ahc_inb(ahc, port+5)) << 40) | (((uint64_t)ahc_inb(ahc, port+6)) << 48) -- 2.30.2