From patchwork Thu Mar 9 16:01:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Zimmermann X-Patchwork-Id: 13167909 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 4768AC7618D for ; Thu, 9 Mar 2023 16:05:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232161AbjCIQE4 (ORCPT ); Thu, 9 Mar 2023 11:04:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48248 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231594AbjCIQCp (ORCPT ); Thu, 9 Mar 2023 11:02:45 -0500 Received: from smtp-out2.suse.de (smtp-out2.suse.de [IPv6:2001:67c:2178:6::1d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0194DF4B7A; Thu, 9 Mar 2023 08:02:44 -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 A5E3C2018E; Thu, 9 Mar 2023 16:02:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1678377762; 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=KeY2ExOwmSx8zLHCGIHXA1tubiVzXH1BzWog2OAH98g=; b=LZFm7R8Of8rUK0MPl8Rv51d9MNca4y4qBiUfwCYMAjb8Ez2GFtPGCqBZOI9FyEB1sWV60f 50vBojV0zeTvTjBJcFnwIW0RX2mB44FAJqfg4RWIWVz5sxsOaX+JZP6Wqy69YJasouluLv jPbSywMOwccCbHhprxaXHud+yKVuxlU= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1678377762; 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=KeY2ExOwmSx8zLHCGIHXA1tubiVzXH1BzWog2OAH98g=; b=LwuaA/5VcZNBiLfHYsJBO6Ju3pNq48IVDuopszjyOASThdVEfJypODY6G6ri3qHb31UWkD yWwOSR1FhQJDVFDA== 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 495E013A73; Thu, 9 Mar 2023 16:02:42 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id +AAeESIDCmQHbgAAMHmgww (envelope-from ); Thu, 09 Mar 2023 16:02:42 +0000 From: Thomas Zimmermann To: deller@gmx.de, geert+renesas@glider.be, timur@kernel.org, rdunlap@infradead.org, paulus@samba.org, benh@kernel.crashing.org, linux@armlinux.org.uk, pjones@redhat.com, adaplas@gmail.com, s.hauer@pengutronix.de, shawnguo@kernel.org, mbroemme@libmpq.org, thomas@winischhofer.net, James.Bottomley@HansenPartnership.com, sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com, corbet@lwn.net Cc: linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Thomas Zimmermann Subject: [PATCH v2 094/101] fbdev/vfb: Duplicate video-mode option string Date: Thu, 9 Mar 2023 17:01:54 +0100 Message-Id: <20230309160201.5163-95-tzimmermann@suse.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230309160201.5163-1-tzimmermann@suse.de> References: <20230309160201.5163-1-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. Allocate the copy's memory with kstrdup() and free it in the module's exit function. Done in preparation of switching the driver to struct option_iter and constifying the option string. v2: * replace static memory with kstrdup()/kfree() (Geert) Signed-off-by: Thomas Zimmermann --- drivers/video/fbdev/vfb.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/vfb.c b/drivers/video/fbdev/vfb.c index 680c88267ef4..de27fe84d820 100644 --- a/drivers/video/fbdev/vfb.c +++ b/drivers/video/fbdev/vfb.c @@ -37,6 +37,7 @@ static u_long videomemorysize = VIDEOMEMSIZE; module_param(videomemorysize, ulong, 0); MODULE_PARM_DESC(videomemorysize, "RAM available to frame buffer (in bytes)"); +static char *mode_option_buf; static char *mode_option = NULL; module_param(mode_option, charp, 0); MODULE_PARM_DESC(mode_option, "Preferred video mode (e.g. 640x480-8@60)"); @@ -412,8 +413,11 @@ static int __init vfb_setup(char *options) /* Test disable for backwards compatibility */ if (!strcmp(this_opt, "disable")) vfb_enable = 0; - else - mode_option = this_opt; + else { + kfree(mode_option_buf); + mode_option_buf = kstrdup(this_opt, GFP_KERNEL); // ignore errors + mode_option = mode_option_buf; + } } return 1; } @@ -543,6 +547,7 @@ static void __exit vfb_exit(void) { platform_device_unregister(vfb_device); platform_driver_unregister(&vfb_driver); + kfree(mode_option_buf); } module_exit(vfb_exit);