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Commit a39796ab authored by Chirag Khurana's avatar Chirag Khurana Committed by Gerrit - the friendly Code Review server
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msm: fbdev: add safety check for msm fb data object 



Add NULL pointer safety check on msm fb data object to
prevent NULL access in rare display user-space usecase
of launching multiple window managers simultaneously.

Change-Id: Ib8baf78b2cbaceb19569693ad9faf53f6b2d1c9f
Signed-off-by: default avatarChirag Khurana <ckhurana@codeaurora.org>
parent f8cb0592

drivers/video/fbdev/msm/mdss_fb.c

+4 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
 * Core MDSS framebuffer driver.

 *

 * Copyright (C) 2007 Google Incorporated

 * Copyright (c) 2008-2018, The Linux Foundation. All rights reserved.

 * Copyright (c) 2008-2019, The Linux Foundation. All rights reserved.

 *

 * This software is licensed under the terms of the GNU General Public

 * License version 2, as published by the Free Software Foundation, and
@@ -3579,6 +3579,9 @@ static int mdss_fb_pan_display_sub(struct fb_var_screeninfo *var, 
{

	struct msm_fb_data_type *mfd = (struct msm_fb_data_type *)info->par;



	if (!mfd)

		return -EPERM;



	if (!mfd->op_enable)

		return -EPERM;