From patchwork Mon Mar 6 15:59:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 659525 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 7A0C6C74A44 for ; Mon, 6 Mar 2023 16:02:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230105AbjCFQCG (ORCPT ); Mon, 6 Mar 2023 11:02:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231464AbjCFQBA (ORCPT ); Mon, 6 Mar 2023 11:01:00 -0500 Received: from smtp-out1.suse.de (smtp-out1.suse.de [195.135.220.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B3DD634333; Mon, 6 Mar 2023 08:00:54 -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 6D26422433; Mon, 6 Mar 2023 16:00:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678118453; 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=ljuuhqpOqDDWmpDnbCdmNaVjarJVcwoFXmhAbwHgMNg=; b=GRYYeHFR+sXD4ucrs0CM8OonsIBECWGTFKP2zZ+ycPeiKN/Mjah8nkUfPVbQagTR5VjTxn NvQdjtxy9CNE4KgWeie9HnUJoGq3+5KZh33kSfFmpFDD/piEkEb4UP4j0rd1gXBPJsjdN8 fsJUR/F5KvsdurHBf/qC8d3xrMZtSpI= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678118453; 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=ljuuhqpOqDDWmpDnbCdmNaVjarJVcwoFXmhAbwHgMNg=; b=uyjMas/nXWwFncG/VqAI8UJM1TBdDYgFItMI4x6cTLqCultdpbHnEf/R5jekOrCfQ5Nazj 7K66MR5r8FFEeVAQ== 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 16F3513A6A; Mon, 6 Mar 2023 16:00:53 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id 0H/OBDUOBmQ/PwAAMHmgww (envelope-from ); Mon, 06 Mar 2023 16:00:53 +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 76/99] fbdev/sstfb: Duplicate video-mode option string Date: Mon, 6 Mar 2023 16:59:53 +0100 Message-Id: <20230306160016.4459-77-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/sstfb.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/sstfb.c b/drivers/video/fbdev/sstfb.c index da296b2ab54a..7cd65f924b08 100644 --- a/drivers/video/fbdev/sstfb.c +++ b/drivers/video/fbdev/sstfb.c @@ -1301,8 +1301,17 @@ static int sstfb_setup(char *options) mem = simple_strtoul (this_opt+4, NULL, 0); else if (!strncmp(this_opt, "gfxclk:",7)) gfxclk = simple_strtoul (this_opt+7, NULL, 0); - 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, "sstfb: Ignoring invalid option, ret=%d\n", ret)) + continue; + if (WARN(ret >= sizeof(mode_option_buf), "sstfb: option too long\n")) + continue; + mode_option = mode_option_buf; + } } return 0; }