From a8e89215591e5f6be3e90056b8a981f6d099ec48 Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Sun, 15 Apr 2018 10:11:57 +0200
Subject: [PATCH] mt7603: add more checks to avoid dereferencing invalid
 pointers in wcid lookup

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
 mt7603_mac.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/mt7603_mac.c b/mt7603_mac.c
index aebfe682..4621d734 100644
--- a/mt7603_mac.c
+++ b/mt7603_mac.c
@@ -363,7 +363,13 @@ mt7603_rx_get_wcid(struct mt7603_dev *dev, u8 idx, bool unicast)
 	if (unicast || !wcid)
 		return wcid;
 
+	if (!wcid->sta)
+		return NULL;
+
 	sta = container_of(wcid, struct mt7603_sta, wcid);
+	if (!sta->vif)
+		return NULL;
+
 	return &sta->vif->wcid;
 }