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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 78449C64EC4 for ; Fri, 10 Mar 2023 14:27:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232403AbjCJO10 (ORCPT ); Fri, 10 Mar 2023 09:27:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232400AbjCJO1K (ORCPT ); Fri, 10 Mar 2023 09:27:10 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2DF214209 for ; Fri, 10 Mar 2023 06:25:28 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 7D7CF6195C for ; Fri, 10 Mar 2023 14:25:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94063C433D2; Fri, 10 Mar 2023 14:25:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678458327; bh=DOJb9D9BCzW3Ov2ZRHdmfpQJEmbgq9MfKARRJQ76lqQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=vX9FsvdG2kUDO7hFR8O86E5UXcOtzT1f6RlwLfVlWu82gg+WXMSXoiO6d+n2PQF7Y hADiuypfKsgIUyh4dGvVvRQlgcVq4LGqGFtryLqtEzERZ1hNeTxI5O+6irTk07yajU YD6+kY7kig4AFQw/7zqPf20urpPMy4lwQJbCOoTo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mathias Nyman , Kees Cook , Sasha Levin Subject: [PATCH 4.19 241/252] usb: host: xhci: mvebu: Iterate over array indexes instead of using pointer math Date: Fri, 10 Mar 2023 14:40:11 +0100 Message-Id: <20230310133726.767696354@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230310133718.803482157@linuxfoundation.org> References: <20230310133718.803482157@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Kees Cook [ Upstream commit 0fbd2cda92cdb00f72080665554a586f88bca821 ] Walking the dram->cs array was seen as accesses beyond the first array item by the compiler. Instead, use the array index directly. This allows for run-time bounds checking under CONFIG_UBSAN_BOUNDS as well. Seen with GCC 13 with -fstrict-flex-arrays: In function 'xhci_mvebu_mbus_config', inlined from 'xhci_mvebu_mbus_init_quirk' at ../drivers/usb/host/xhci-mvebu.c:66:2: ../drivers/usb/host/xhci-mvebu.c:37:28: warning: array subscript 0 is outside array bounds of 'const struct mbus_dram_window[0]' [-Warray-bounds=] 37 | writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) | | ~~^~~~~~ Cc: Mathias Nyman Signed-off-by: Kees Cook Link: https://lore.kernel.org/r/20230204183651.never.663-kees@kernel.org Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/host/xhci-mvebu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-mvebu.c b/drivers/usb/host/xhci-mvebu.c index 32e1585687885..fc9d6189c310f 100644 --- a/drivers/usb/host/xhci-mvebu.c +++ b/drivers/usb/host/xhci-mvebu.c @@ -31,7 +31,7 @@ static void xhci_mvebu_mbus_config(void __iomem *base, /* Program each DRAM CS in a seperate window */ for (win = 0; win < dram->num_cs; win++) { - const struct mbus_dram_window *cs = dram->cs + win; + const struct mbus_dram_window *cs = &dram->cs[win]; writel(((cs->size - 1) & 0xffff0000) | (cs->mbus_attr << 8) | (dram->mbus_dram_target_id << 4) | 1, -- 2.39.2