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staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan

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commit 8687bf9ef9551bcf93897e33364d121667b1aadf upstream.

Function _rtl92e_wx_set_scan calls memcpy without checking the length.
A user could control that length and trigger a buffer overflow.
Fix by checking the length is within the maximum allowed size.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Lee Gibson <leegib@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210226145157.424065-1-leegib@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lee Gibson 2021-02-26 14:51:57 +00:00 committed by Greg Kroah-Hartman
parent 8f586a5982
commit e644fc4ab7
1 changed files with 4 additions and 3 deletions
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7
drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
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@ -406,9 +406,10 @@ static int _rtl92e_wx_set_scan(struct net_device *dev,
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);
}
}