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mac80211: validate extended element ID is present

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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.I5cacc176da94ba316877c6e10fe3ceec8b4dbd7d@changeid
Cc: stable@vger.kernel.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Berg 2021-12-11 20:10:24 +01:00 committed by Greg Kroah-Hartman
parent 595a684fa6
commit 03029bb044
1 changed files with 2 additions and 0 deletions
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2
net/mac80211/util.c
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@ -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];