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| author | Johannes Berg <johannes.berg@intel.com> | 2021-12-11 22:10:24 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2021-12-14 13:20:27 +0300 |
| commit | 768c0b19b50665e337c96858aa2b7928d6dcf756 (patch) | |
| tree | fffe8564116501e6fcabf175c8cf4b04b64cf127 /net/mac80211/util.c | |
| parent | e08ebd6d7b90ae81f21425ca39136f5b2272580f (diff) | |
| download | linux-768c0b19b50665e337c96858aa2b7928d6dcf756.tar.xz | |
mac80211: validate extended element ID is present
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@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20211211201023.f30a1b128c07.I5cacc176da94ba316877c6e10fe3ceec8b4dbd7d@changeid
Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/util.c')
| -rw-r--r-- | net/mac80211/util.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 43df2f0c5db9..6c2934854d3c 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -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: |