From patchwork Mon Mar 6 15:59:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 660167 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 F1B16C77B61 for ; Mon, 6 Mar 2023 16:01:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231219AbjCFQBY (ORCPT ); Mon, 6 Mar 2023 11:01:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41664 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231178AbjCFQAr (ORCPT ); Mon, 6 Mar 2023 11:00:47 -0500 Received: from smtp-out1.suse.de (smtp-out1.suse.de [IPv6:2001:67c:2178:6::1c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EF54F30195; Mon, 6 Mar 2023 08:00:45 -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-out1.suse.de (Postfix) with ESMTPS id 5973E223F9; Mon, 6 Mar 2023 16:00:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118444; 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=5xZuWufF0BKBnJgqnmUzO92Agzss6jwSfAKczEAHKgw=; b=Ri+OkwPppiCoGP9RFfeKBJINJh8GGPK6sO/aql/OWm+N8e38md54yG1eM8FoghdD0HGk4u 98L3izBlLDXHA0Fkb9m1lGhvHOU9rH+lV2sURp1LZLRPC8osURiIGBD14qdloYQD/O9oew ZaOjvQeKFDdzqG5HgOkl2SqHrxtvyOw= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118444; 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=5xZuWufF0BKBnJgqnmUzO92Agzss6jwSfAKczEAHKgw=; b=aqrGuidrSFqrQf7eR1g3H2MBDl0S41CbUCmCHHRkWYuQ5h3+tMTkJShxYePoVy3k1lhxoG itYNAd1KxDdLOyDA== 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 00BD513A6A; Mon, 6 Mar 2023 16:00:43 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id WPrbOisOBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:43 +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 52/99] fbdev/ocfb: Duplicate video-mode option string Date: Mon, 6 Mar 2023 16:59:29 +0100 Message-Id: <20230306160016.4459-53-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 switching the driver to struct option_iter and constifying the option string. Signed-off-by: Thomas Zimmermann --- drivers/video/fbdev/ocfb.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/video/fbdev/ocfb.c b/drivers/video/fbdev/ocfb.c index da7e1457e58f..34684191f2f0 100644 --- a/drivers/video/fbdev/ocfb.c +++ b/drivers/video/fbdev/ocfb.c @@ -75,9 +75,18 @@ static int __init ocfb_setup(char *options) return 0; while ((curr_opt = strsep(&options, ",")) != NULL) { + static char mode_option_buf[256]; + int ret; + if (!*curr_opt) continue; - mode_option = curr_opt; + + ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", curr_opt); + if (WARN(ret < 0, "ocfb: ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "ocfb: option too long\n")) + continue; + mode_option = mode_option_buf; } return 0;