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staging: rtl8188eu: fix potential memory corruption in rtw_check_beacon_data()

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The "ie_len" is a value in the 1-255 range that comes from the user.  We
have to cap it to ensure that it's not too large or it could lead to
memory corruption.

Fixes: 9a7fe54ddc ("staging: r8188eu: Add source files for new driver - part 1")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/YEHyQCrFZKTXyT7J@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2021-03-05 11:56:32 +03:00 committed by Greg Kroah-Hartman
parent 87107518d7
commit d4ac640322
1 changed files with 5 additions and 0 deletions
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5
drivers/staging/rtl8188eu/core/rtw_ap.c
View file

@ -791,6 +791,7 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf, int len)
p = rtw_get_ie(ie + _BEACON_IE_OFFSET_, WLAN_EID_SSID, &ie_len,
pbss_network->ie_length - _BEACON_IE_OFFSET_);
if (p && ie_len > 0) {
ie_len = min_t(int, ie_len, sizeof(pbss_network->ssid.ssid));
memset(&pbss_network->ssid, 0, sizeof(struct ndis_802_11_ssid));
memcpy(pbss_network->ssid.ssid, p + 2, ie_len);
pbss_network->ssid.ssid_length = ie_len;
@ -811,6 +812,7 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf, int len)
p = rtw_get_ie(ie + _BEACON_IE_OFFSET_, WLAN_EID_SUPP_RATES, &ie_len,
pbss_network->ie_length - _BEACON_IE_OFFSET_);
if (p) {
ie_len = min_t(int, ie_len, NDIS_802_11_LENGTH_RATES_EX);
memcpy(supportRate, p + 2, ie_len);
supportRateNum = ie_len;
}
@ -819,6 +821,8 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf, int len)
p = rtw_get_ie(ie + _BEACON_IE_OFFSET_, WLAN_EID_EXT_SUPP_RATES,
&ie_len, pbss_network->ie_length - _BEACON_IE_OFFSET_);
if (p) {
ie_len = min_t(int, ie_len,
NDIS_802_11_LENGTH_RATES_EX - supportRateNum);
memcpy(supportRate + supportRateNum, p + 2, ie_len);
supportRateNum += ie_len;
}
@ -934,6 +938,7 @@ int rtw_check_beacon_data(struct adapter *padapter, u8 *pbuf, int len)
pht_cap->mcs.rx_mask[0] = 0xff;
pht_cap->mcs.rx_mask[1] = 0x0;
ie_len = min_t(int, ie_len, sizeof(pmlmepriv->htpriv.ht_cap));
memcpy(&pmlmepriv->htpriv.ht_cap, p + 2, ie_len);
}