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 X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0EFA9C31E45 for ; Thu, 13 Jun 2019 16:10:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D8C1E20866 for ; Thu, 13 Jun 2019 16:10:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560442216; bh=OwZ0qLFkEiHNIobShGBggg/4oh/hdfHyky43omuQniU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=pd/AM9+/3CEcc9Mkd2Sx+1MDM6ryM65g205CJ9HILwTBnFNRm8xcheHGlBdGHQIFA yLzOufPSZsMa7jhoxbVMM2G2UXbbVdtWnUFbP7HIrYXTU+SfgxQHy2OIMfR5+Xn47Z ma3/FY2Wjfm9EiCJVJ9RxPsn1vdBzft3rXGSS9pw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391339AbfFMQKD (ORCPT ); Thu, 13 Jun 2019 12:10:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:33078 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731256AbfFMIoK (ORCPT ); Thu, 13 Jun 2019 04:44:10 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0050721479; Thu, 13 Jun 2019 08:44:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560415449; bh=OwZ0qLFkEiHNIobShGBggg/4oh/hdfHyky43omuQniU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VOBU6KFcn9RoPisi1FcpuSBwiGK18aFFOkFJfze+n33//TdassBAWJprGxXul5IzO AFJOdhCDDwaUAcURKfACVe5etDJQfCmI2MuN5OlOcuzIgQfC4vPMKsg9nsVvhMi7ro eCD2BAW3l60Rm01NhSsy1QZXGQTlAx/xIcgnf5Cc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Kangjie Lu , Aditya Pakki , Ferenc Bakonyi , Bartlomiej Zolnierkiewicz , Sasha Levin Subject: [PATCH 4.19 099/118] video: hgafb: fix potential NULL pointer dereference Date: Thu, 13 Jun 2019 10:33:57 +0200 Message-Id: <20190613075649.723453822@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190613075643.642092651@linuxfoundation.org> References: <20190613075643.642092651@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org [ Upstream commit ec7f6aad57ad29e4e66cc2e18e1e1599ddb02542 ] When ioremap fails, hga_vram should not be dereferenced. The fix check the failure to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu Cc: Aditya Pakki Cc: Ferenc Bakonyi [b.zolnierkie: minor patch summary fixup] Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Sasha Levin --- drivers/video/fbdev/hgafb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/video/fbdev/hgafb.c b/drivers/video/fbdev/hgafb.c index 463028543173..59e1cae57948 100644 --- a/drivers/video/fbdev/hgafb.c +++ b/drivers/video/fbdev/hgafb.c @@ -285,6 +285,8 @@ static int hga_card_detect(void) hga_vram_len = 0x08000; hga_vram = ioremap(0xb0000, hga_vram_len); + if (!hga_vram) + goto error; if (request_region(0x3b0, 12, "hgafb")) release_io_ports = 1; -- 2.20.1