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staging: rtl8723bs: fix stack buffer overflow in OnAssocReq IE parsing

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commit 6ef0e1c10455927867cac8f0ed6b49f328f8cf95 upstream.

The Supported Rates IE length from an incoming Association Request frame
was used directly as the memcpy() length when copying into a fixed-size
16-byte stack buffer (supportRate). A malicious station can advertise an
IE length larger than 16 bytes, causing a stack buffer overflow.

Clamp ie_len to the buffer size before copying the Supported Rates IE,
and correct the bounds check when merging Extended Supported Rates to
prevent a second potential overflow.

This prevents kernel stack corruption triggered by malformed association
requests.

Signed-off-by: Navaneeth K <knavaneeth786@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Navaneeth K
2025-11-20 16:33:08 +00:00
committed by Greg Kroah-Hartman
parent 30c558447e
commit 34620eb602
1 changed files with 4 additions and 1 deletions
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5
drivers/staging/rtl8723bs/core/rtw_mlme_ext.c
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@@ -1034,6 +1034,9 @@ unsigned int OnAssocReq(struct adapter *padapter, union recv_frame *precv_frame)
status = WLAN_STATUS_CHALLENGE_FAIL;
goto OnAssocReqFail;
} else {
if (ie_len > sizeof(supportRate))
ie_len = sizeof(supportRate);
memcpy(supportRate, p+2, ie_len);
supportRateNum = ie_len;
@@ -1041,7 +1044,7 @@ unsigned int OnAssocReq(struct adapter *padapter, union recv_frame *precv_frame)
pkt_len - WLAN_HDR_A3_LEN - ie_offset);
if (p) {
if (supportRateNum <= sizeof(supportRate)) {
if (supportRateNum + ie_len <= sizeof(supportRate)) {
memcpy(supportRate+supportRateNum, p+2, ie_len);
supportRateNum += ie_len;
}