mwifiex: fix 802.11n/WPA detection

BugLink: https://bugs.launchpad.net/bugs/1840520
commit df612421fe2566654047769c6852ffae1a31df16 upstream.

Commit 63d7ef36103d ("mwifiex: Don't abort on small, spec-compliant
vendor IEs") adjusted the ieee_types_vendor_header struct, which
inadvertently messed up the offsets used in
mwifiex_is_wpa_oui_present(). Add that offset back in, mirroring
mwifiex_is_rsn_oui_present().

As it stands, commit 63d7ef36103d breaks compatibility with WPA (not
WPA2) 802.11n networks, since we hit the "info: Disable 11n if AES is
not supported by AP" case in mwifiex_is_network_compatible().

Fixes: 63d7ef36103d ("mwifiex: Don't abort on small, spec-compliant vendor IEs")
Cc: <stable@vger.kernel.org>
Signed-off-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/net/wireless/marvell/mwifiex/main.h b/drivers/net/wireless/marvell/mwifiex/main.h
index ca791f1cd01daefd4d4c035365411630f8c12059..80fb179f6982613d397d79d6ef67d86532465aff 100644 (file)
--- a/drivers/net/wireless/marvell/mwifiex/main.h
+++ b/drivers/net/wireless/marvell/mwifiex/main.h
@@ -122,6 +122,7 @@ enum {
 
 #define MWIFIEX_MAX_TOTAL_SCAN_TIME    (MWIFIEX_TIMER_10S - MWIFIEX_TIMER_1S)
 
+#define WPA_GTK_OUI_OFFSET                             2
 #define RSN_GTK_OUI_OFFSET                             2
 
 #define MWIFIEX_OUI_NOT_PRESENT                        0

diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
index d496933de8c89b62f0c24aae2742d64b6c045003..a6384539a6ca2546ad8d3a504b8962ec96b4613d 100644 (file)
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -181,7 +181,8 @@ mwifiex_is_wpa_oui_present(struct mwifiex_bssdescriptor *bss_desc, u32 cipher)
        u8 ret = MWIFIEX_OUI_NOT_PRESENT;
 
        if (has_vendor_hdr(bss_desc->bcn_wpa_ie, WLAN_EID_VENDOR_SPECIFIC)) {
-               iebody = (struct ie_body *) bss_desc->bcn_wpa_ie->data;
+               iebody = (struct ie_body *)((u8 *)bss_desc->bcn_wpa_ie->data +
+                                           WPA_GTK_OUI_OFFSET);
                oui = &mwifiex_wpa_oui[cipher][0];
                ret = mwifiex_search_oui_in_ie(iebody, oui);
                if (ret)