From: Brian Norris briannorris@chromium.org
commit 63d7ef36103d26f20325a921ecc96a3288560146 upstream.
Per the 802.11 specification, vendor IEs are (at minimum) only required to contain an OUI. A type field is also included in ieee80211.h (struct ieee80211_vendor_ie) but doesn't appear in the specification. The remaining fields (subtype, version) are a convention used in WMM headers.
Thus, we should not reject vendor-specific IEs that have only the minimum length (3 bytes) -- we should skip over them (since we only want to match longer IEs, that match either WMM or WPA formats). We can reject elements that don't have the minimum-required 3 byte OUI.
While we're at it, move the non-standard subtype and version fields into the WMM structs, to avoid this confusion in the future about generic "vendor header" attributes.
Fixes: 685c9b7750bf ("mwifiex: Abort at too short BSS descriptor element") Cc: Takashi Iwai tiwai@suse.de Signed-off-by: Brian Norris briannorris@chromium.org Reviewed-by: Takashi Iwai tiwai@suse.de Signed-off-by: Kalle Valo kvalo@codeaurora.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/net/wireless/marvell/mwifiex/fw.h | 12 +++++++++--- drivers/net/wireless/marvell/mwifiex/scan.c | 18 +++++++++++------- drivers/net/wireless/marvell/mwifiex/sta_ioctl.c | 4 ++-- drivers/net/wireless/marvell/mwifiex/wmm.c | 2 +- 4 files changed, 23 insertions(+), 13 deletions(-)
--- a/drivers/net/wireless/marvell/mwifiex/fw.h +++ b/drivers/net/wireless/marvell/mwifiex/fw.h @@ -1719,9 +1719,10 @@ struct mwifiex_ie_types_wmm_queue_status struct ieee_types_vendor_header { u8 element_id; u8 len; - u8 oui[4]; /* 0~2: oui, 3: oui_type */ - u8 oui_subtype; - u8 version; + struct { + u8 oui[3]; + u8 oui_type; + } __packed oui; } __packed;
struct ieee_types_wmm_parameter { @@ -1735,6 +1736,9 @@ struct ieee_types_wmm_parameter { * Version [1] */ struct ieee_types_vendor_header vend_hdr; + u8 oui_subtype; + u8 version; + u8 qos_info_bitmap; u8 reserved; struct ieee_types_wmm_ac_parameters ac_params[IEEE80211_NUM_ACS]; @@ -1752,6 +1756,8 @@ struct ieee_types_wmm_info { * Version [1] */ struct ieee_types_vendor_header vend_hdr; + u8 oui_subtype; + u8 version;
u8 qos_info_bitmap; } __packed; --- a/drivers/net/wireless/marvell/mwifiex/scan.c +++ b/drivers/net/wireless/marvell/mwifiex/scan.c @@ -1349,21 +1349,25 @@ int mwifiex_update_bss_desc_with_ie(stru break;
case WLAN_EID_VENDOR_SPECIFIC: - if (element_len + 2 < sizeof(vendor_ie->vend_hdr)) - return -EINVAL; - vendor_ie = (struct ieee_types_vendor_specific *) current_ptr;
- if (!memcmp - (vendor_ie->vend_hdr.oui, wpa_oui, - sizeof(wpa_oui))) { + /* 802.11 requires at least 3-byte OUI. */ + if (element_len < sizeof(vendor_ie->vend_hdr.oui.oui)) + return -EINVAL; + + /* Not long enough for a match? Skip it. */ + if (element_len < sizeof(wpa_oui)) + break; + + if (!memcmp(&vendor_ie->vend_hdr.oui, wpa_oui, + sizeof(wpa_oui))) { bss_entry->bcn_wpa_ie = (struct ieee_types_vendor_specific *) current_ptr; bss_entry->wpa_offset = (u16) (current_ptr - bss_entry->beacon_buf); - } else if (!memcmp(vendor_ie->vend_hdr.oui, wmm_oui, + } else if (!memcmp(&vendor_ie->vend_hdr.oui, wmm_oui, sizeof(wmm_oui))) { if (total_ie_len == sizeof(struct ieee_types_wmm_parameter) || --- a/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c +++ b/drivers/net/wireless/marvell/mwifiex/sta_ioctl.c @@ -1374,7 +1374,7 @@ mwifiex_set_gen_ie_helper(struct mwifiex /* Test to see if it is a WPA IE, if not, then it is a * gen IE */ - if (!memcmp(pvendor_ie->oui, wpa_oui, + if (!memcmp(&pvendor_ie->oui, wpa_oui, sizeof(wpa_oui))) { find_wpa_ie = 1; break; @@ -1383,7 +1383,7 @@ mwifiex_set_gen_ie_helper(struct mwifiex /* Test to see if it is a WPS IE, if so, enable * wps session flag */ - if (!memcmp(pvendor_ie->oui, wps_oui, + if (!memcmp(&pvendor_ie->oui, wps_oui, sizeof(wps_oui))) { priv->wps.session_enable = true; mwifiex_dbg(priv->adapter, MSG, --- a/drivers/net/wireless/marvell/mwifiex/wmm.c +++ b/drivers/net/wireless/marvell/mwifiex/wmm.c @@ -240,7 +240,7 @@ mwifiex_wmm_setup_queue_priorities(struc mwifiex_dbg(priv->adapter, INFO, "info: WMM Parameter IE: version=%d,\t" "qos_info Parameter Set Count=%d, Reserved=%#x\n", - wmm_ie->vend_hdr.version, wmm_ie->qos_info_bitmap & + wmm_ie->version, wmm_ie->qos_info_bitmap & IEEE80211_WMM_IE_AP_QOSINFO_PARAM_SET_CNT_MASK, wmm_ie->reserved);