[PATCH 1/2] drm: not to read outside the boundary for CRC source name.

[Dingchen Zhang]

'n-1' is the index to access the last character of CRC source name.

Cc:Leo Li <sunpeng.li at amd.com>, Harry Wentland<Harry.Wentland at amd.com>
Signed-off-by: Dingchen Zhang <dingchen.zhang at amd.com>
---
 drivers/gpu/drm/drm_debugfs_crc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
index 585169f0dcc5..e20adef9d623 100644
--- a/drivers/gpu/drm/drm_debugfs_crc.c
+++ b/drivers/gpu/drm/drm_debugfs_crc.c
@@ -131,8 +131,8 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
 	if (IS_ERR(source))
 		return PTR_ERR(source);
 
-	if (source[len] == '\n')
-		source[len] = '\0';
+	if (source[len-1] == '\n')
+		source[len-1] = '\0';
 
 	ret = crtc->funcs->verify_crc_source(crtc, source, &values_cnt);
 	if (ret)
-- 
2.17.1