From b676da70c495acb2515de76300596e9147806ead Mon Sep 17 00:00:00 2001
From: Rakesh Ughreja <rakesh.a.ughreja@intel.com>
Date: Tue, 24 Oct 2017 18:26:47 +0530
Subject: [PATCH] ALSA: hda: Abort capability probe on invalid capability
Git-commit: b676da70c495acb2515de76300596e9147806ead
Patch-mainline: v4.15-rc1
References: bsc#1051510

On reading wrong capability pointer values driver may crash, so whenever
driver discovers unknown HDA capability, log it as error and stop traversing
the link list further.

Signed-off-by: Rakesh Ughreja <rakesh.a.ughreja@intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

---
 sound/hda/hdac_controller.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -319,7 +319,8 @@ int snd_hdac_bus_parse_capabilities(stru
 			break;
 
 		default:
-			dev_dbg(bus->dev, "Unknown capability %d\n", cur_cap);
+			dev_err(bus->dev, "Unknown capability %d\n", cur_cap);
+			cur_cap = 0;
 			break;
 		}