diff options
| -rw-r--r-- | drivers/net/wireless/mediatek/mt76/mt7996/mac.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/mac.c b/drivers/net/wireless/mediatek/mt76/mt7996/mac.c index 771c16e8d10c..0dbd4662bc84 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7996/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7996/mac.c @@ -647,6 +647,14 @@ mt7996_mac_fill_rx(struct mt7996_dev *dev, enum mt76_rxq_id q, status->last_amsdu = amsdu_info == MT_RXD4_LAST_AMSDU_FRAME; } + /* IEEE 802.11 fragmentation can only be applied to unicast frames. + * Hence, drop fragments with multicast/broadcast RA. + * This check fixes vulnerabilities, like CVE-2020-26145. + */ + if ((ieee80211_has_morefrags(fc) || seq_ctrl & IEEE80211_SCTL_FRAG) && + FIELD_GET(MT_RXD3_NORMAL_ADDR_TYPE, rxd3) != MT_RXD3_NORMAL_U2M) + return -EINVAL; + hdr_gap = (u8 *)rxd - skb->data + 2 * remove_pad; if (hdr_trans && ieee80211_has_morefrags(fc)) { if (mt7996_reverse_frag0_hdr_trans(skb, hdr_gap)) |