From patchwork Mon Mar 6 15:59:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 659542 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 97F24C74A4B for ; Mon, 6 Mar 2023 16:01:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230449AbjCFQBQ (ORCPT ); Mon, 6 Mar 2023 11:01:16 -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 S230321AbjCFQAm (ORCPT ); Mon, 6 Mar 2023 11:00:42 -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 6CDDD2FCDE; Mon, 6 Mar 2023 08:00:41 -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 10025223DC; Mon, 6 Mar 2023 16:00:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118440; 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=K0gGAw7ZqBoMZQQEk3RoG354RK+dTClSMJKbERgVuz8=; b=QvMmCKNwXDv+cSg00PFI22+IxUxHLK5DLRZbbuZ7Jz3xMDPN8olle+TigcBeEyicia25DD Jut0LD6tq+fjFP8aNsGs29r3vtZbGeOuaOD/G343DAf+MB7w9ZbH1ZAFFlMuQo+YOVd0RW pIPAjIXHfM27OBAyk49NBjnyuUkE8M4= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118440; 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=K0gGAw7ZqBoMZQQEk3RoG354RK+dTClSMJKbERgVuz8=; b=5CRCQQCEKlKMirs1zh8B4JrZ1nWQZbgPPGMJJ3GDYDKTYcECCiXaqRdIMIsCZw4+V6toOx V7/iz9RnNDnWfACw== 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 9E85413513; Mon, 6 Mar 2023 16:00:39 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id cFzMJScOBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:39 +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 41/99] fbdev/kyrofb: Duplicate video-mode option string Date: Mon, 6 Mar 2023 16:59:18 +0100 Message-Id: <20230306160016.4459-42-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/kyro/fbdev.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/video/fbdev/kyro/fbdev.c b/drivers/video/fbdev/kyro/fbdev.c index 0596573ef140..a171f1119e4d 100644 --- a/drivers/video/fbdev/kyro/fbdev.c +++ b/drivers/video/fbdev/kyro/fbdev.c @@ -579,7 +579,15 @@ static int __init kyrofb_setup(char *options) } else if (strcmp(this_opt, "nomtrr") == 0) { nomtrr = 1; } else { - mode_option = this_opt; + static char mode_option_buf[256]; + int ret; + + ret = snprintf(mode_option_buf, sizeof(mode_option_buf), "%s", this_opt); + if (WARN(ret < 0, "kyrofb: ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "kyrofb: option too long\n")) + continue; + mode_option = mode_option_buf; } }