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staging: rtl8192u: fix ->ssid overflow in r8192_wx_set_scan() 

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: 5f53d8ca3d ("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>
This commit is contained in:
Dan Carpenter 2021-03-05 11:12:49 +03:00 committed by Greg Kroah-Hartman
parent fd3ce6557d
commit 87107518d7
1 changed files with 4 additions and 2 deletions
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6
drivers/staging/rtl8192u/r8192U_wx.c
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@ -331,8 +331,10 @@ static int r8192_wx_set_scan(struct net_device *dev, struct iw_request_info *a,
struct iw_scan_req *req = (struct iw_scan_req *)b; struct iw_scan_req *req = (struct iw_scan_req *)b;
if (req->essid_len) { if (req->essid_len) {
ieee->current_network.ssid_len = req->essid_len; int len = min_t(int, req->essid_len, IW_ESSID_MAX_SIZE);
memcpy(ieee->current_network.ssid, req->essid, req->essid_len);
ieee->current_network.ssid_len = len;
memcpy(ieee->current_network.ssid, req->essid, len);
} }
} }