diff options
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 7b278e9aa1a4..fb7fd896cd0d 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -135,13 +135,16 @@ u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len) { u16 fc; - if (len < 24) + /* drop ACK/CTS frames and incorrect hdr len (ctrl) */ + if (len < 16) return NULL; fc = le16_to_cpu(hdr->frame_control); switch (fc & IEEE80211_FCTL_FTYPE) { case IEEE80211_FTYPE_DATA: + if (len < 24) /* drop incorrect hdr len (data) */ + return NULL; switch (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) { case IEEE80211_FCTL_TODS: return hdr->addr1; @@ -154,6 +157,8 @@ u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len) } break; case IEEE80211_FTYPE_MGMT: + if (len < 24) /* drop incorrect hdr len (mgmt) */ + return NULL; return hdr->addr3; case IEEE80211_FTYPE_CTL: if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_PSPOLL) |