From patchwork Mon Mar 6 15:59:36 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 659536 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 2EAA7C77B6C for ; Mon, 6 Mar 2023 16:01:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230370AbjCFQB0 (ORCPT ); Mon, 6 Mar 2023 11:01:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231263AbjCFQAt (ORCPT ); Mon, 6 Mar 2023 11:00:49 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 65FD32E0D3; Mon, 6 Mar 2023 08:00:48 -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 218AB1FEB6; Mon, 6 Mar 2023 16:00:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118447; 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=MS+PFmaqiOmf95A5S5Zq6/GUizF4f5fYETWFaMoxpps=; b=eyAcjdzDglmtF4oh1f0MNlaik2bGJgNkrgTFv1LJfMo4v1hE2CKxGYM9r1k5sOmX1luf0b Pt6wK2chtkXQCnXhJq+hJN4v3enn9riFmiEEq9S+7RuJSjKCBFMXzAvoC6vT205OWvaiJ0 1Ln1Nod3dTOz4yy9dnVEH86cOCkZLaw= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118447; 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=MS+PFmaqiOmf95A5S5Zq6/GUizF4f5fYETWFaMoxpps=; b=nuUXLk2Pj692pTF+R3MQ78A7dHt9zUtyxTUn/qqQKTI7goCHVs9q8w74qYk1XVpRrUC1dB OGeaL7bNptKdhkAA== 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 B846313513; Mon, 6 Mar 2023 16:00:46 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id cIAfLC4OBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:46 +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 59/99] fbdev/pm3fb: Duplicate video-mode option string Date: Mon, 6 Mar 2023 16:59:36 +0100 Message-Id: <20230306160016.4459-60-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/pm3fb.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/pm3fb.c b/drivers/video/fbdev/pm3fb.c index b46a471df9ae..d0a2cf623c60 100644 --- a/drivers/video/fbdev/pm3fb.c +++ b/drivers/video/fbdev/pm3fb.c @@ -1526,8 +1526,17 @@ static int __init pm3fb_setup(char *options) hwcursor = simple_strtoul(this_opt + 9, NULL, 0); else if (!strncmp(this_opt, "nomtrr", 6)) nomtrr = 1; - else - mode_option = this_opt; + else { + static char mode_option_buf[256]; + int ret; + + ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", this_opt); + if (WARN(ret < 0, "pm3fb: ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "pm3fb: option too long\n")) + continue; + mode_option = mode_option_buf; + } } return 0; }