linux-kernel - [PATCH 5.15 011/177] mac80211: validate extended element ID is present

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Message-Id: <20211220143040.460577210@linuxfoundation.org>
Date:   Mon, 20 Dec 2021 15:32:41 +0100
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+59bdff68edce82e393b6@...kaller.appspotmail.com,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH 5.15 011/177] mac80211: validate extended element ID is present

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

commit 768c0b19b50665e337c96858aa2b7928d6dcf756 upstream.

Before attempting to parse an extended element, verify that
the extended element ID is present.

Fixes: 41cbb0f5a295 ("mac80211: add support for HE")
Reported-by: syzbot+59bdff68edce82e393b6@...kaller.appspotmail.com
Link: https://lore.kernel.org/r/20211211201023.f30a1b128c07.I5cacc176da94ba316877c6e10fe3ceec8b4dbd7d@changeid
Cc: stable@...r.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/mac80211/util.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -943,7 +943,12 @@ static void ieee80211_parse_extension_el
 					      struct ieee802_11_elems *elems)
 {
 	const void *data = elem->data + 1;
-	u8 len = elem->datalen - 1;
+	u8 len;
+
+	if (!elem->datalen)
+		return;
+
+	len = elem->datalen - 1;
 
 	switch (elem->data[0]) {
 	case WLAN_EID_EXT_HE_MU_EDCA: