From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 30 Mar 2021 09:31:52 +0000 (+0300)
Subject: drm: xlnx: zynqmp: fix a memset in zynqmp_dp_train()
X-Git-Tag: v5.13-rc1~123^2~4^2~8
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=5842ab76bbfadb37eaea91e53c1efe34ae504e4a;p=thirdparty%2Fkernel%2Flinux.git

drm: xlnx: zynqmp: fix a memset in zynqmp_dp_train()

The dp->train_set[] for this driver is only two characters, not four so
this memsets too much.  Fortunately, this ends up corrupting a struct
hole and not anything important.

Fixes: d76271d22694 ("drm: xlnx: DRM/KMS driver for Xilinx ZynqMP DisplayPort Subsystem")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/YGLwCBMotnrKZu6P@mwanda
---

diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp.c b/drivers/gpu/drm/xlnx/zynqmp_dp.c
index 99158ee67d02b..59d1fb017da01 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_dp.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_dp.c
@@ -866,7 +866,7 @@ static int zynqmp_dp_train(struct zynqmp_dp *dp)
 		return ret;
 
 	zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1);
-	memset(dp->train_set, 0, 4);
+	memset(dp->train_set, 0, sizeof(dp->train_set));
 	ret = zynqmp_dp_link_train_cr(dp);
 	if (ret)
 		return ret;