linux-kernel - [PATCH 5.4 128/129] cfg80211: regulatory: reject invalid hints

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Message-Id: <20200908152236.265156088@linuxfoundation.org>
Date:   Tue,  8 Sep 2020 17:26:09 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+d451401ffd00a60677ee@...kaller.appspotmail.com,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 5.4 128/129] cfg80211: regulatory: reject invalid hints

From: Johannes Berg <johannes.berg@...el.com>

commit 47caf685a6854593348f216e0b489b71c10cbe03 upstream.

Reject invalid hints early in order to not cause a kernel
WARN later if they're restored to or similar.

Reported-by: syzbot+d451401ffd00a60677ee@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=d451401ffd00a60677ee
Link: https://lore.kernel.org/r/20200819084648.13956-1-johannes@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/wireless/reg.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/wireless/reg.c
+++ b/net/wireless/reg.c
@@ -2941,6 +2941,9 @@ int regulatory_hint_user(const char *alp
 	if (WARN_ON(!alpha2))
 		return -EINVAL;
 
+	if (!is_world_regdom(alpha2) && !is_an_alpha2(alpha2))
+		return -EINVAL;
+
 	request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL);
 	if (!request)
 		return -ENOMEM;