From aed315f32b821c379c21716cd8d9074315d6cb97 Mon Sep 17 00:00:00 2001
From: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>
Date: Tue, 11 Jun 2019 11:57:43 -0700
Subject: [PATCH] disp: msm: dsi: add  check for buffer length before copy

The change adds a check to make sure the length of bytes being
copied don't exceed the size of the destination buffer
causing an overflow.

Change-Id: Ib3ca3705e4179ccda1af11279e96e167baee6a3b
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>
---
 msm/dsi/dsi_display.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/msm/dsi/dsi_display.c b/msm/dsi/dsi_display.c
index 94524c4a79..52e9a0f0bf 100644
--- a/msm/dsi/dsi_display.c
+++ b/msm/dsi/dsi_display.c
@@ -1120,6 +1120,9 @@ static ssize_t debugfs_dump_info_read(struct file *file,
 			"\tClock master = %s\n",
 			display->ctrl[display->clk_master_idx].ctrl->name);
 
+	if (len > user_len)
+		len = user_len;
+
 	if (copy_to_user(user_buf, buf, len)) {
 		kfree(buf);
 		return -EFAULT;