From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1750845AbdAXJRA (ORCPT ); Tue, 24 Jan 2017 04:17:00 -0500 Received: from mail-pg0-f65.google.com ([74.125.83.65]:35405 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750764AbdAXJQ6 (ORCPT ); Tue, 24 Jan 2017 04:16:58 -0500 From: Arvind Yadav To: airlied@linux.ie Cc: alexander.deucher@amd.com, christian.koenig@amd.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH] drm: radeon: radeon_ttm: Handle return NULL error from ioremap_nocache Date: Tue, 24 Jan 2017 14:46:16 +0530 Message-Id: <1485249376-864-1-git-send-email-arvind.yadav.cs@gmail.com> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Here, If ioremap_nocache will fail. It will return NULL. Kernel can run into a NULL-pointer dereference. This error check will avoid NULL pointer dereference. Signed-off-by: Arvind Yadav --- drivers/gpu/drm/radeon/radeon_ttm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c index 0cf03cc..fc129fd 100644 --- a/drivers/gpu/drm/radeon/radeon_ttm.c +++ b/drivers/gpu/drm/radeon/radeon_ttm.c @@ -502,6 +502,8 @@ static int radeon_ttm_io_mem_reserve(struct ttm_bo_device *bdev, struct ttm_mem_ mem->bus.addr = ioremap_nocache(mem->bus.base + mem->bus.offset, mem->bus.size); + if (!mem->bus.addr) + return -ENOMEM; /* * Alpha: Use just the bus offset plus -- 1.9.1