[PATCH] staging: rtl8723bs: prevent ->ssid overflow in rtw_wx_set_scan()

[Wenlong Zhang]

Commit 74b6b20df8cf ("staging: rtl8188eu: prevent ->ssid overflow in rtw_wx_set_scan()")
fixed up the staging driver rtl8188eu by adding another check 
to prevent writing beyond the end of the ->ssid[] array.

Resolve this by properly fixing up the rtl8723bs driver's version of
rtw_wx_set_scan() 

Reported-by: Wenlong Zhang(iLifetruth) <yixiaonn@xxxxxxxxx>
Fixes: 74b6b20df8cf ("staging: rtl8188eu: prevent ->ssid overflow in rtw_wx_set_scan()")

Signed-off-by: Wenlong Zhang <yixiaonn@xxxxxxxxx>

---
 drivers/staging/rtl8723bs/os_dep/ioctl_linux.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
index 902ac8169948..6fc1020cea11 100644
--- a/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
+++ b/drivers/staging/rtl8723bs/os_dep/ioctl_linux.c
@@ -1351,9 +1351,9 @@ static int rtw_wx_set_scan(struct net_device *dev, struct iw_request_info *a,
 
 					sec_len = *(pos++); len -= 1;
 
-					if (sec_len > 0 && sec_len <= len) {
+					if (sec_len > 0 && sec_len <= len && sec_len <= 32) {
 						ssid[ssid_index].SsidLength = sec_len;
-						memcpy(ssid[ssid_index].Ssid, pos, ssid[ssid_index].SsidLength);
+						memcpy(ssid[ssid_index].Ssid, pos, sec_len);
 						/* DBG_871X("%s COMBO_SCAN with specific ssid:%s, %d\n", __func__ */
 						/* 	, ssid[ssid_index].Ssid, ssid[ssid_index].SsidLength); */
 						ssid_index++;
-- 
2.15.0