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| author | Brian Norris <briannorris@chromium.org> | 2019-06-15 03:13:20 +0300 |
|---|---|---|
| committer | Kalle Valo <kvalo@codeaurora.org> | 2019-06-24 16:22:50 +0300 |
| commit | 63d7ef36103d26f20325a921ecc96a3288560146 (patch) | |
| tree | d75e9b8d6adee2d5596a97be1bdc7feb5c69f0f4 /drivers/net/wireless/marvell/mwifiex/scan.c | |
| parent | 608fd7214323bd3bb2c288f68253e5bb634d4f49 (diff) | |
| download | linux-63d7ef36103d26f20325a921ecc96a3288560146.tar.xz | |
mwifiex: Don't abort on small, spec-compliant vendor IEs
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>
Diffstat (limited to 'drivers/net/wireless/marvell/mwifiex/scan.c')
| -rw-r--r-- | drivers/net/wireless/marvell/mwifiex/scan.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c index c269a0de9413..e2786ab612ca 100644 --- a/drivers/net/wireless/marvell/mwifiex/scan.c +++ b/drivers/net/wireless/marvell/mwifiex/scan.c @@ -1361,21 +1361,25 @@ int mwifiex_update_bss_desc_with_ie(struct mwifiex_adapter *adapter, 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) || |