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 <lee...@gmail.com>
---
drivers/staging/rtl8712/rtl871x_cmd.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/rtl8712/rtl871x_cmd.c
b/drivers/staging/rtl8712/rtl871x_cmd.c
index 18116469bd31..75716f59044d 100644
--- 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);
--
2.25.1
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