From: Johannes Berg johannes.berg@intel.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@syzkaller.appspotmail.com Link: https://lore.kernel.org/r/20211211201023.f30a1b128c07.I5cacc176da94ba316877c... Cc: stable@vger.kernel.org Signed-off-by: Johannes Berg johannes.berg@intel.com --- net/mac80211/util.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 7fa9871b1db9..9c1a20ca6344 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -1102,6 +1102,8 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action, elems->max_idle_period_ie = (void *)pos; break; case WLAN_EID_EXTENSION: + if (!elen) + break; if (pos[0] == WLAN_EID_EXT_HE_MU_EDCA && elen >= (sizeof(*elems->mu_edca_param_set) + 1)) { elems->mu_edca_param_set = (void *)&pos[1];