From patchwork Mon Mar 6 16:00:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 660148 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 C37E7C6FD20 for ; Mon, 6 Mar 2023 16:02:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230252AbjCFQCS (ORCPT ); Mon, 6 Mar 2023 11:02:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42340 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231504AbjCFQBF (ORCPT ); Mon, 6 Mar 2023 11:01:05 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6358735279; Mon, 6 Mar 2023 08:00:58 -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 2104A1FEE8; Mon, 6 Mar 2023 16:00:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118457; 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=NRH8FDBlUenGi6t3vADvmnZXBzAlyd1DOo5qbgN/AjE=; b=FcmR5Ilu2FyZ0aLZLBjI89PfVeogAgi8Mj3NX5fDD6u8EnA92IzM/KZ9RUvIFMIYffMmFF ttlyLQCdemVx47Xa+brtK/X9Wh6quLpVYb+bi6gx0DfVvACXPIetiiUzl4s++i38cXFW12 9ulDrdY5EcKxarL+MWNJ4DKzGUtOXPI= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118457; 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=NRH8FDBlUenGi6t3vADvmnZXBzAlyd1DOo5qbgN/AjE=; b=wY5srk6jZqqWfP4NxccbClrm872HRKp9pzYLQDFdEis3ybVZ+2xKQmslhC1gIsFyykRMs+ IPUbHcSbEW1RVMAw== 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 AF5ED13513; Mon, 6 Mar 2023 16:00:56 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id eDDJKTgOBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:56 +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 85/99] fbdev/tridentfb: Duplicate video-mode option string Date: Mon, 6 Mar 2023 17:00:02 +0100 Message-Id: <20230306160016.4459-86-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/tridentfb.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/tridentfb.c b/drivers/video/fbdev/tridentfb.c index 6099b9768ba1..21cee678047b 100644 --- a/drivers/video/fbdev/tridentfb.c +++ b/drivers/video/fbdev/tridentfb.c @@ -1800,8 +1800,17 @@ static int __init tridentfb_setup(char *options) memdiff = simple_strtoul(opt + 8, NULL, 0); else if (!strncmp(opt, "nativex=", 8)) nativex = simple_strtoul(opt + 8, NULL, 0); - else - mode_option = opt; + else { + static char mode_option_buf[256]; + int ret; + + ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", opt); + if (WARN(ret < 0, "tridentfb: ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "tridentfb: option too long\n")) + continue; + mode_option = mode_option_buf; + } } return 0; }