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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Johannes Berg <johannes.berg@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 041/639] cfg80211: regulatory: make initialization more robust
Date:   Fri, 24 Jan 2020 10:23:31 +0100
Message-Id: <20200124093052.593172030@linuxfoundation.org>
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From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit 71e5e886806ee3f8e0c44ed945eb2e4d6659c6e3 ]

Since my change to split out the regulatory init to occur later,
any issues during earlier cfg80211_init() or errors during the
platform device allocation would lead to crashes later. Make this
more robust by checking that the earlier initialization succeeded.

Fixes: d7be102f2945 ("cfg80211: initialize regulatory keys/database later")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/wireless/reg.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/wireless/reg.c b/net/wireless/reg.c
index 64841238df855..5643bdee7198f 100644
--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -3870,6 +3870,15 @@ static int __init regulatory_init_db(void)
 {
 	int err;
 
+	/*
+	 * It's possible that - due to other bugs/issues - cfg80211
+	 * never called regulatory_init() below, or that it failed;
+	 * in that case, don't try to do any further work here as
+	 * it's doomed to lead to crashes.
+	 */
+	if (IS_ERR_OR_NULL(reg_pdev))
+		return -EINVAL;
+
 	err = load_builtin_regdb_keys();
 	if (err)
 		return err;
-- 
2.20.1