Commit 768c0b19 authored by Johannes Berg's avatar Johannes Berg
Browse files

mac80211: validate extended element ID is present 



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

Fixes: 41cbb0f5 ("mac80211: add support for HE")
Reported-by: default avatar <syzbot+59bdff68edce82e393b6@syzkaller.appspotmail.com>
Link: https://lore.kernel.org/r/20211211201023.f30a1b128c07.I5cacc176da94ba316877c6e10fe3ceec8b4dbd7d@changeid


Cc: stable@vger.kernel.org
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
parent e08ebd6d

net/mac80211/util.c

+6 −1
Original line number Diff line number Diff line
@@ -943,7 +943,12 @@ static void ieee80211_parse_extension_element(u32 *crc, 
					      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: