Commit 17b6bf58 authored by Dan Carpenter's avatar Dan Carpenter Committed by Sasha Levin
Browse files

Staging: rtl8723bs: prevent buffer overflow in update_sta_support_rate()

commit b65a2d8c upstream.

The "ie_len" variable is in the 0-255 range and it comes from the
network.  If it's over NDIS_802_11_LENGTH_RATES_EX (16) then that will
lead to memory corruption.

Fixes: 554c0a3a

 ("staging: Add rtl8723bs sdio wifi driver")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200603101958.GA1845750@mwanda

Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c576799e
......@@ -1830,12 +1830,14 @@ int update_sta_support_rate(struct adapter *padapter, u8 *pvar_ie, uint var_ie_l
pIE = (struct ndis_80211_var_ie *)rtw_get_ie(pvar_ie, _SUPPORTEDRATES_IE_, &ie_len, var_ie_len);
if (!pIE)
return _FAIL;
if (ie_len > sizeof(pmlmeinfo->FW_sta_info[cam_idx].SupportedRates))
return _FAIL;
memcpy(pmlmeinfo->FW_sta_info[cam_idx].SupportedRates, pIE->data, ie_len);
supportRateNum = ie_len;
pIE = (struct ndis_80211_var_ie *)rtw_get_ie(pvar_ie, _EXT_SUPPORTEDRATES_IE_, &ie_len, var_ie_len);
if (pIE)
if (pIE && (ie_len <= sizeof(pmlmeinfo->FW_sta_info[cam_idx].SupportedRates) - supportRateNum))
memcpy((pmlmeinfo->FW_sta_info[cam_idx].SupportedRates + supportRateNum), pIE->data, ie_len);
return _SUCCESS;
......
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