staging: rtl8188eu: Fix incorrect response to SIOCGIWESSID

[ Upstream commit b77992d2df9e47144354d1b25328b180afa33442 ]

When not associated with an AP, wifi device drivers should respond to the
SIOCGIWESSID ioctl with a zero-length string for the SSID, which is the
behavior expected by dhcpcd.

Currently, this driver returns an error code (-1) from the ioctl call,
which causes dhcpcd to assume that the device is not a wireless interface
and therefore it fails to work correctly with it thereafter.

This problem was reported and tested at
https://github.com/lwfinger/rtl8188eu/issues/234.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c b/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
index d598fec4abbf75df2374c4df014aee5710c4c0be..0bfb4fe8a86ebe48201b3ebf901dd0c5996ced4b 100644 (file)
--- a/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8188eu/os_dep/ioctl_linux.c
@@ -1396,19 +1396,13 @@ static int rtw_wx_get_essid(struct net_device *dev,
        if ((check_fwstate(pmlmepriv, _FW_LINKED)) ||
            (check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE))) {
                len = pcur_bss->Ssid.SsidLength;
-
-               wrqu->essid.length = len;
-
                memcpy(extra, pcur_bss->Ssid.Ssid, len);
-
-               wrqu->essid.flags = 1;
        } else {
-               ret = -1;
-               goto exit;
+               len = 0;
+               *extra = 0;
        }
-
-exit:
-
+       wrqu->essid.length = len;
+       wrqu->essid.flags = 1;
 
        return ret;
 }