diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2021-12-11 22:10:24 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-22 11:19:03 +0300 |
| commit | 03029bb044ccee60adbc93e70713f3ae58abc3a1 (patch) | |
| tree | 00ca430ae53ca06e69e82dd70a1f25ec06aee993 /net/mac80211 | |
| parent | 595a684fa6f23b21958379a18cfa83862c73c2e1 (diff) | |
| download | linux-03029bb044ccee60adbc93e70713f3ae58abc3a1.tar.xz | |
mac80211: validate extended element ID is present
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>
Diffstat (limited to 'net/mac80211')
| -rw-r--r-- | net/mac80211/util.c | 2 |
1 files changed, 2 insertions, 0 deletions
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]; |