From: Ben Skeggs <bskeggs@redhat.com>
Date: Mon, 8 Sep 2014 00:33:32 +0000 (+1000)
Subject: drm/nouveau/bios: memset dcb struct to zero before parsing
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3b163cb4c566c773d049648ec8da752d37f5c200;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git

drm/nouveau/bios: memset dcb struct to zero before parsing

commit 595d373f1e9c9ce0fc946457fdb488e8a58972cd upstream.

Fixes type/mask calculation being based on uninitialised data for VGA
outputs.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c b/drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c
index 2d9b9d7a7992..f3edd2841f2d 100644
--- a/drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c
+++ b/drivers/gpu/drm/nouveau/core/subdev/bios/dcb.c
@@ -124,6 +124,7 @@ dcb_outp_parse(struct nouveau_bios *bios, u8 idx, u8 *ver, u8 *len,
 	       struct dcb_output *outp)
 {
 	u16 dcb = dcb_outp(bios, idx, ver, len);
+	memset(outp, 0x00, sizeof(*outp));
 	if (dcb) {
 		if (*ver >= 0x20) {
 			u32 conn = nv_ro32(bios, dcb + 0x00);