From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=134.134.136.31; helo=mga06.intel.com; envelope-from=ruiyu.ni@intel.com; receiver=edk2-devel@lists.01.org Received: from mga06.intel.com (mga06.intel.com [134.134.136.31]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 7BC2A211799D6 for ; Mon, 15 Oct 2018 22:42:33 -0700 (PDT) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga104.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 15 Oct 2018 22:42:33 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,387,1534834800"; d="scan'208";a="81760186" Received: from ray-dev.ccr.corp.intel.com ([10.239.9.11]) by orsmga008.jf.intel.com with ESMTP; 15 Oct 2018 22:42:32 -0700 From: Ruiyu Ni To: edk2-devel@lists.01.org Cc: Star Zeng , Jiewen Yao , Steven Shi Date: Tue, 16 Oct 2018 13:43:30 +0800 Message-Id: <20181016054335.47460-8-ruiyu.ni@intel.com> X-Mailer: git-send-email 2.16.1.windows.1 In-Reply-To: <20181016054335.47460-1-ruiyu.ni@intel.com> References: <20181016054335.47460-1-ruiyu.ni@intel.com> Subject: [PATCH v2 07/12] MdeModulePkg/UsbKb: Don't access key codes when length is wrong X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 16 Oct 2018 05:42:33 -0000 Per USB HID spec, the buffer holding key codes should be 8-byte long. Today's code assumes that the key codes buffer length is 8-byte long and unconditionally accesses the key codes buffer. It's incorrect. The patch fixes the issue by returning Device Error when the length is less than 8-byte. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ruiyu Ni Cc: Star Zeng Cc: Jiewen Yao Cc: Steven Shi --- MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c b/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c index 9cb4b5db6b..7505951c82 100644 --- a/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c +++ b/MdeModulePkg/Bus/Usb/UsbKbDxe/KeyBoard.c @@ -1059,6 +1059,10 @@ KeyboardHandler ( // Byte 1 is reserved. // Bytes 2 to 7 are keycodes. // + if (DataLength < 8) { + return EFI_DEVICE_ERROR; + } + CurKeyCodeBuffer = (UINT8 *) Data; OldKeyCodeBuffer = UsbKeyboardDevice->LastKeyCodeArray; -- 2.16.1.windows.1