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Sun, 05 Apr 2026 03:17:34 -0700 (PDT) From: Delene Tchio Romuald To: gregkh@linuxfoundation.org Cc: Ethan Tidmore , Sam Daly , linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Delene Tchio Romuald Subject: [PATCH v3 3/5] staging: rtl8723bs: fix out-of-bounds read in portctrl() Date: Sun, 5 Apr 2026 11:15:46 +0100 Message-ID: <20260405101548.124829-4-delenetchior1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260405101548.124829-1-delenetchior1@gmail.com> References: <20260405101548.124829-1-delenetchior1@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In portctrl(), the pointer is advanced by hdrlen + iv_len + LLC_HEADER_LENGTH and then 2 bytes are read via memcpy() to extract the ether_type field. There is no check that the frame is large enough to contain these fields, so a short frame leads to an out-of-bounds read on kernel heap memory. This code is reachable during 802.1X authentication when the station is in the ieee8021x_blocked state. Add a frame length check before the pointer arithmetic and wrap the existing ether_type extraction in the else branch so that short frames are dropped safely. Found by reviewing memory operations in the driver. Not tested on hardware. Signed-off-by: Delene Tchio Romuald --- v3: - Rebased on staging-next - Sent as numbered series with proper Cc from get_maintainer.pl v2: - Rebased on staging-next drivers/staging/rtl8723bs/core/rtw_recv.c | 28 +++++++++++++++-------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/drivers/staging/rtl8723bs/core/rtw_recv.c b/drivers/staging/rtl8723bs/core/rtw_recv.c index 11ae99e53b86a..8e38cb9791755 100644 --- a/drivers/staging/rtl8723bs/core/rtw_recv.c +++ b/drivers/staging/rtl8723bs/core/rtw_recv.c @@ -539,17 +539,25 @@ static union recv_frame *portctrl(struct adapter *adapter, union recv_frame *pre prtnframe = precv_frame; - /* get ether_type */ - ptr = ptr + pfhdr->attrib.hdrlen + pfhdr->attrib.iv_len + LLC_HEADER_LENGTH; - memcpy(&be_tmp, ptr, 2); - ether_type = ntohs(be_tmp); - - if (ether_type == eapol_type) - prtnframe = precv_frame; - else { - /* free this frame */ - rtw_free_recvframe(precv_frame, &adapter->recvpriv.free_recv_queue); + /* Ensure frame has LLC header and ether_type */ + if (pfhdr->len < pattrib->hdrlen + + pattrib->iv_len + LLC_HEADER_LENGTH + 2) { + rtw_free_recvframe(precv_frame, + &adapter->recvpriv.free_recv_queue); prtnframe = NULL; + } else { + /* get ether_type */ + ptr += pattrib->hdrlen + + pattrib->iv_len + + LLC_HEADER_LENGTH; + memcpy(&be_tmp, ptr, 2); + ether_type = ntohs(be_tmp); + + if (ether_type != eapol_type) { + rtw_free_recvframe(precv_frame, + &adapter->recvpriv.free_recv_queue); + prtnframe = NULL; + } } } else { /* allowed */ -- 2.43.0