staging: rtl8712: Fix possible buffer overflow in r8712_sitesurvey_cmd

Function r8712_sitesurvey_cmd 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.

Signed-off-by: Lee Gibson <leegib@gmail.com>
Link: https://lore.kernel.org/r/20210301132648.420296-1-leegib@gmail.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8712/rtl871x_cmd.c b/drivers/staging/rtl8712/rtl871x_cmd.c
index 18116469bd31636532e28ab8858726202969db65..75716f59044d9c76458ceb4816fb232157f21da1 100644 (file)
--- a/drivers/staging/rtl8712/rtl871x_cmd.c
+++ b/drivers/staging/rtl8712/rtl871x_cmd.c
@@ -192,8 +192,10 @@ u8 r8712_sitesurvey_cmd(struct _adapter *padapter,
        psurveyPara->ss_ssidlen = 0;
        memset(psurveyPara->ss_ssid, 0, IW_ESSID_MAX_SIZE + 1);
        if (pssid && pssid->SsidLength) {
-               memcpy(psurveyPara->ss_ssid, pssid->Ssid, pssid->SsidLength);
-               psurveyPara->ss_ssidlen = cpu_to_le32(pssid->SsidLength);
+               int len = min_t(int, pssid->SsidLength, IW_ESSID_MAX_SIZE);
+
+               memcpy(psurveyPara->ss_ssid, pssid->Ssid, len);
+               psurveyPara->ss_ssidlen = cpu_to_le32(len);
        }
        set_fwstate(pmlmepriv, _FW_UNDER_SURVEY);
        r8712_enqueue_cmd(pcmdpriv, ph2c);