From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Dan Carpenter dan.carpenter@oracle.com
commit 87107518d7a93fec6cdb2559588862afeee800fb upstream.
We need to cap len at IW_ESSID_MAX_SIZE (32) to avoid memory corruption. This can be controlled by the user via the ioctl.
Fixes: 5f53d8ca3d5d ("Staging: add rtl8192SU wireless usb driver") Signed-off-by: Dan Carpenter dan.carpenter@oracle.com Cc: stable stable@vger.kernel.org Link: https://lore.kernel.org/r/YEHoAWMOSZBUw91F@mwanda Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/staging/rtl8192u/r8192U_wx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/staging/rtl8192u/r8192U_wx.c +++ b/drivers/staging/rtl8192u/r8192U_wx.c @@ -331,8 +331,10 @@ static int r8192_wx_set_scan(struct net_ struct iw_scan_req *req = (struct iw_scan_req *)b;
if (req->essid_len) { - ieee->current_network.ssid_len = req->essid_len; - memcpy(ieee->current_network.ssid, req->essid, req->essid_len); + int len = min_t(int, req->essid_len, IW_ESSID_MAX_SIZE); + + ieee->current_network.ssid_len = len; + memcpy(ieee->current_network.ssid, req->essid, len); } }