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[217.32.158.205]) by smtp.gmail.com with ESMTPSA id l6sm2772013edw.90.2021.02.26.03.48.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Feb 2021 03:48:33 -0800 (PST) From: Lee Gibson To: gregkh@linuxfoundation.org Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Lee Gibson Subject: [PATCH] staging: rtl8192e: Fix possible buffer overflow in _rtl92e_wx_set_scan Date: Fri, 26 Feb 2021 11:48:29 +0000 Message-Id: <20210226114829.316980-1-leegib@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Function _rtl92e_wx_set_scan 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 --- drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c index 16bcee13f64b..2acc4f314732 100644 --- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c +++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c @@ -406,6 +406,9 @@ static int _rtl92e_wx_set_scan(struct net_device *dev, struct iw_scan_req *req = (struct iw_scan_req *)b; if (req->essid_len) { + if (req->essid_len > IW_ESSID_MAX_SIZE) + req->essid_len = IW_ESSID_MAX_SIZE; + ieee->current_network.ssid_len = req->essid_len; memcpy(ieee->current_network.ssid, req->essid, req->essid_len); -- 2.25.1