[PATCH 4.9 039/103] mwifiex: fix 802.11n/WPA detection

Greg Kroah-Hartman
2019-08-22T17:40:32Z

From: Brian Norris <briannorris@chromium.org>

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>

---
drivers/net/wireless/marvell/mwifiex/main.h | 1 +
drivers/net/wireless/marvell/mwifiex/scan.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/marvell/mwifiex/main.h
+++ b/drivers/net/wireless/marvell/mwifiex/main.h
@@ -120,6 +120,7 @@ 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
--- 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 mwifie
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)