From patchwork Mon Mar 6 15:58:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 660182 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 4E8B8C76195 for ; Mon, 6 Mar 2023 16:01:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231299AbjCFQAv (ORCPT ); Mon, 6 Mar 2023 11:00:51 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230283AbjCFQAb (ORCPT ); Mon, 6 Mar 2023 11:00:31 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5C65D25E09; 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 B7D4B1FDF4; 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=vdfHPhTBCGbkD8dn/FGrM9tZFQ/JKKvg+W2ZUY5fZ2k=; b=Y8eRGE5qfFP9QU7xFr7LAvCJIrNz6/6y759KGnQNVZgmDZNHY9/CDhS4NJLxexvfvxzZSY lonRvO8DMU0qj4y9gqVh8tHqTHa2d7Gaqp+Jvn0bSDS609BNahN0scaARk8dAbF9di0GWv g7FhWsd6nytTlo5pq1TpuR5O+e7sYQc= 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=vdfHPhTBCGbkD8dn/FGrM9tZFQ/JKKvg+W2ZUY5fZ2k=; b=MUijP6g30XGyMBYKa57zr7ttsIjAdWwhQhtNrUpaG/lICac5ZXQVViKi7T60QzZhnLIEAc klT8c3AfpwLBU9Dw== 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 5E07613513; Mon, 6 Mar 2023 16:00:27 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id MAggFhsOBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:27 +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 09/99] fbdev/atafb: Duplicate video-mode option string Date: Mon, 6 Mar 2023 16:58:46 +0100 Message-Id: <20230306160016.4459-10-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/atafb.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/video/fbdev/atafb.c b/drivers/video/fbdev/atafb.c index 2bc4089865e6..331e72096ebb 100644 --- a/drivers/video/fbdev/atafb.c +++ b/drivers/video/fbdev/atafb.c @@ -2946,8 +2946,16 @@ static int __init atafb_setup(char *options) if (!*this_opt) continue; if ((temp = get_video_mode(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, "atafb: ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "atafb: option too long\n")) + continue; + mode_option = mode_option_buf; default_par = temp; - mode_option = this_opt; } else if (!strcmp(this_opt, "inverse")) fb_invert_cmaps(); else if (!strncmp(this_opt, "hwscroll_", 9)) {