From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from m16.mail.163.com (m16.mail.163.com [117.135.210.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E20BD1A6820; Sat, 17 Oct 2026 06:19:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=117.135.210.2 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792217986; cv=none; b=IuheOw827XwQXlnqkQ4R1vlGaYxPspYDKMKzbee8ZUBqLDuWtcZTxTQPIPr6W6fdxB+jDrHxnqPEK7baNSG71yfmOe1Qm18QNUV7Hph2PUxTRXcN51Q4raMsAzLP92YszrapdGqu+GIH2i18fj3NUSFG7iM6tpNRPOPePdypjv4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1792217986; c=relaxed/simple; bh=1eO4q/o/wsoIWoBvY89BkJES9RF8qD6tLLdU8h2sLSo=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=DvJHkDXrMWAXnChfmxPHCtXLNnsm0CGB6Q5/q+s56azgX1+es0xm+rfopuYRGX/DngQ8rcHldwvgCZ2uPtRbcxMluQN780KQnmYrGfDCEdLTHcjUxCDOEbuOAoydmgNrxhw7Eop5/6hBWapoxtxkZPpKa6sOCJnap8Ivv7JtUQQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=FIo5/v74; arc=none smtp.client-ip=117.135.210.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="FIo5/v74" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=xu MBQ28bm3FO0/CpfyclRDufAhjncezY/NZQmfK3LDQ=; b=FIo5/v74joY4y1pkf1 cGcq3sKuXWKMf71htr7s7c/VyeLMlx08QCLQRdN1uDM4bFX0Dl/NTfVOmkK5vwlX iFkFmLJsJr4jhwG607yVhe5LO+Wj+tQw29Ral5vIZzYXEo5lp3x1+zNbvJrbwtrt 5XjoYvaOe9O+l4LGDzheuCQ0Q= Received: from pc.localdomain (unknown []) by gzga-smtp-mtada-g1-1 (Coremail) with SMTP id _____wDH77xpE9NqnFWgAQ--.8282S2; Sat, 17 Oct 2026 14:19:23 +0800 (CST) From: Jiale Yao To: Ping Cheng , Jason Gerecke , Jiri Kosina , Benjamin Tissoires , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Jiale Yao Subject: [PATCH] HID: wacom: reject short input reports Date: Sat, 17 Oct 2026 14:19:19 +0800 Message-Id: <20261017061920.3781644-1-yaojiale02@163.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:_____wDH77xpE9NqnFWgAQ--.8282S2 X-Coremail-Antispam: 1Uf129KBjvdXoWruFyfGw15tF4DuF1kAFWUurg_yoWDJFb_ua 48ZwsrX34kWFnFyr1xKr15Zryq9ws5WFnxXr4Yyr93Jry8XF15AFs3Zws8WrW5ur4kX3Z7 KrWDJ34kZrnFgjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7sRXBMtUUUUUU== X-CM-SenderInfo: x1dryxhdohiji6rwjhhfrp/xtbCzQtuqGrTE2saFQAA3O wacom_raw_event() passes incoming reports to the pen serial extractor and the device-specific IRQ parsers before the HID core validates the declared report length. A short report can therefore make either consumer read past the valid input data. Require the complete report described by the HID report descriptor before invoking either parser. Signed-off-by: Jiale Yao --- drivers/hid/wacom_sys.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c index 40770affdbde..85e966e80012 100644 --- a/drivers/hid/wacom_sys.c +++ b/drivers/hid/wacom_sys.c @@ -175,6 +175,9 @@ static int wacom_raw_event(struct hid_device *hdev, struct hid_report *report, if (wacom->wacom_wac.features.type == BOOTLOADER) return 0; + if (size < hid_report_len(report)) + return 0; + if (wacom_wac_pen_serial_enforce(hdev, report, raw_data, size)) return -1; -- 2.34.1