From patchwork Mon Mar 6 15:58:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 660185 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 CB269C761AF for ; Mon, 6 Mar 2023 16:01:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231346AbjCFQAy (ORCPT ); Mon, 6 Mar 2023 11:00:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230293AbjCFQAb (ORCPT ); Mon, 6 Mar 2023 11:00:31 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5E66D28879; Mon, 6 Mar 2023 08:00:29 -0800 (PST) Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id 582BD1FDF2; Mon, 6 Mar 2023 16:00:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118427; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eakX9A1d2cL4JJsysk9bsXBTplb66PKOYwFwVUy7Prk=; b=NSZ3kfbaNFcSXTo+rqXNolhBFGsO47x8A18lNRu8ko1zfE4Ha2wzTO5rJV9vZFt+gOhjPJ QZU5NfSvsHLeHmAAvOnJhSKcsJzBQ2WzTOSBVH2x3cjJCtlP8w3ba7HTxRgLzeUmPAeT2O +Z18bN8KdGZ4NwY3xZhLWoZ14qRgQeY= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118427; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eakX9A1d2cL4JJsysk9bsXBTplb66PKOYwFwVUy7Prk=; b=s+jFgKokFJJBBjICEuIXOMPa2srozkEi7v2eNk1Dm986GXURegWRkr5Di6ht2i1aeJ8UTf jNuNyfE6VhcOFVAQ== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id 011F413513; Mon, 6 Mar 2023 16:00:26 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id eD8cOxoOBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:26 +0000 From: Thomas Zimmermann To: deller@gmx.de, paulus@samba.org, benh@kernel.crashing.org, linux@armlinux.org.uk, pjones@redhat.com, timur@kernel.org, adaplas@gmail.com, s.hauer@pengutronix.de, shawnguo@kernel.org, mbroemme@libmpq.org, thomas@winischhofer.net, James.Bottomley@HansenPartnership.com, spock@gentoo.org, sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com, geert+renesas@glider.be, corbet@lwn.net Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Thomas Zimmermann Subject: [PATCH 08/99] fbdev/arkfb: Duplicate video-mode option string Date: Mon, 6 Mar 2023 16:58:45 +0100 Message-Id: <20230306160016.4459-9-tzimmermann@suse.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230306160016.4459-1-tzimmermann@suse.de> References: <20230306160016.4459-1-tzimmermann@suse.de> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Assume that the driver does not own the option string or its substrings and hence duplicate the option string for the video mode. The driver only parses the option string once as part of module initialization, so use a static buffer to store the duplicated mode option. Linux automatically frees the memory upon releasing the module. Done in preparation of constifying the option string. Signed-off-by: Thomas Zimmermann --- drivers/video/fbdev/arkfb.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/arkfb.c b/drivers/video/fbdev/arkfb.c index 60a96fdb5dd8..f83fcdaec7a0 100644 --- a/drivers/video/fbdev/arkfb.c +++ b/drivers/video/fbdev/arkfb.c @@ -1196,8 +1196,17 @@ static int __init arkfb_init(void) if (fb_get_options("arkfb", &option)) return -ENODEV; - if (option && *option) - mode_option = option; + if (option && *option) { + static char mode_option_buf[256]; + int ret; + + ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", option); + if (WARN(ret < 0, "arkfb: ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "arkfb: option too long\n")) + continue; + mode_option = mode_option_buf; + } #endif pr_debug("arkfb: initializing\n");