From mboxrd@z Thu Jan 1 00:00:00 1970 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 0F71CC433F5 for ; Mon, 18 Apr 2022 13:49:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240350AbiDRNvs (ORCPT ); Mon, 18 Apr 2022 09:51:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59800 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244836AbiDRNa5 (ORCPT ); Mon, 18 Apr 2022 09:30:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 569231EC51; Mon, 18 Apr 2022 05:55:45 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id E810D6115A; Mon, 18 Apr 2022 12:55:44 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DD430C385A7; Mon, 18 Apr 2022 12:55:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1650286544; bh=XGwqFT0oW95ciFt+vOb6lf4/eOqu5hiiwyCdGxGNLCk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=A4rDdWDXWsszIHqfbUBsmcIlmFn5vJAgqBxVPAeEL16kPVaNLwkKjIIvJIWV0QFSX cgk5FpZemnYjg1rkY1z2JbwDdMFi2v4ds+GDeBL4qlKP5YxZVdyNeyCfQqUGyd80RK MkwqoMndkEg/O9tI3LUGxYSbHp1jkEdtKYoonuwo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Evgeny Novikov , Kirill Shilimanov , Helge Deller , Sasha Levin Subject: [PATCH 4.14 166/284] video: fbdev: w100fb: Reset global state Date: Mon, 18 Apr 2022 14:12:27 +0200 Message-Id: <20220418121216.464677930@linuxfoundation.org> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20220418121210.689577360@linuxfoundation.org> References: <20220418121210.689577360@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Evgeny Novikov [ Upstream commit 8738ddcac644964ae128ccd3d80d48773c8d528e ] w100fb_probe() did not reset the global state to its initial state. This can result in invocation of iounmap() even when there was not the appropriate successful call of ioremap(). For instance, this may be the case if first probe fails after two successful ioremap() while second probe fails when first ioremap() fails. The similar issue is with w100fb_remove(). The patch fixes both bugs. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Evgeny Novikov Co-developed-by: Kirill Shilimanov Signed-off-by: Kirill Shilimanov Signed-off-by: Helge Deller Signed-off-by: Sasha Levin --- drivers/video/fbdev/w100fb.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/video/fbdev/w100fb.c b/drivers/video/fbdev/w100fb.c index ffda1d68fb05..566eacd903a3 100644 --- a/drivers/video/fbdev/w100fb.c +++ b/drivers/video/fbdev/w100fb.c @@ -772,12 +772,18 @@ int w100fb_probe(struct platform_device *pdev) fb_dealloc_cmap(&info->cmap); kfree(info->pseudo_palette); } - if (remapped_fbuf != NULL) + if (remapped_fbuf != NULL) { iounmap(remapped_fbuf); - if (remapped_regs != NULL) + remapped_fbuf = NULL; + } + if (remapped_regs != NULL) { iounmap(remapped_regs); - if (remapped_base != NULL) + remapped_regs = NULL; + } + if (remapped_base != NULL) { iounmap(remapped_base); + remapped_base = NULL; + } if (info) framebuffer_release(info); return err; @@ -802,8 +808,11 @@ static int w100fb_remove(struct platform_device *pdev) fb_dealloc_cmap(&info->cmap); iounmap(remapped_base); + remapped_base = NULL; iounmap(remapped_regs); + remapped_regs = NULL; iounmap(remapped_fbuf); + remapped_fbuf = NULL; framebuffer_release(info); -- 2.34.1