From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 5492D3218BA for ; Wed, 26 Aug 2026 15:33:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787758393; cv=none; b=fDGtIvH640UeCag7qQtY5v5Ugu8gM1N9EY7UFr/GRNqmmuIa5OTR81hTO5HkH/k6/0wG+vCLiPNd6lOcbq5rX0LyZz713EBp0LTJ4yuyV90Uta0tYuzvA1gyVuXitmo7n79oryBDufc1fHfWOd+jUapuD9iRGjXcW1IXIKTpNQI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787758393; c=relaxed/simple; bh=RKbBEjp1fUUA/+MSwYnhxzW2//n7EqHPNr2IX5KxNss=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Xpdpoc+/548GVbQxuRdBkqggCHACYCvqpC3WwQBabGULGs31tYaNUJ66ZDydVmt1Ql95dNdGcjdIrFT0pE8xYfDbkloflBdyhqBTdeaB+MxKy+3zsFdWxPWNNGhCNM5H5+SixUlPG4+IpjFVIzKM5XjDuT7crsVgNAoPDxeiXkU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PCC64xh5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PCC64xh5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2F531F00A3A; Wed, 26 Aug 2026 15:33:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787758390; bh=jhynmfT8c1xmd8AgGqPtN+ExwCg6a6DLUssQEzCzges=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=PCC64xh5uB7sjrPb6ww/0DfElF+FvqOxXulonx0bGNxiPNAnWAI5zGIsGeYpzad1J kRfwyO7EmZ3DiLbvWZf2xZ0mxPTo8r5CFXF6uhWdc19bpHT7eAqW8SnJ9DUjFjlVXp agUs88DqQcMEBOYwTIdS56YWQyS7TMhHAhKDc7t0/D4nQvC/qiipuYoxD7fqupXxRs r4DPPJSf23/TVIAyN9N5iffA8hKJblh/i7pAFMnc2ZdPDwNPTftzPEbUKRodRhxS8T V/mFB1YH0zW5tWsmrr41iusaz+thlUqtZHv32rg53rkX1gL77MTaVs6FT38a/Qio34 B26vb3KzoRQFg== From: Sasha Levin To: stable@vger.kernel.org Cc: Michael Zaidman , =?UTF-8?q?Sebasti=C3=A1n=20Josu=C3=A9=20Alba=20Vives?= , Jiri Kosina , Sasha Levin Subject: [PATCH 6.6.y 1/2] HID: ft260: validate i2c input report length Date: Wed, 26 Aug 2026 11:33:06 -0400 Message-ID: <20260826153307.1183086-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026082537-numbing-bronco-2d22@gregkh> References: <2026082537-numbing-bronco-2d22@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michael Zaidman [ Upstream commit 80c4bbb2b38513e9c3d84805fa61a0ee16d79c45 ] Add two checks to ft260_raw_event() to prevent out-of-bounds reads from malicious or malfunctioning devices: First, reject reports shorter than the 2-byte header (report ID + length fields). Without this, even accessing xfer->length on a 1-byte report is an OOB read. Second, validate xfer->length against the actual data capacity of the received HID report. Each I2C data report ID (0xD0 through 0xDE) defines a different report size in the HID descriptor, so the available payload varies per report. A corrupted length field could cause memcpy to read beyond the report buffer. Reported-by: Sebastián Josué Alba Vives Signed-off-by: Michael Zaidman Signed-off-by: Jiri Kosina Stable-dep-of: bf3e39df3a39 ("HID: ft260: fix stack-use-after-return write in I2C read race") Signed-off-by: Sasha Levin --- drivers/hid/hid-ft260.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/hid/hid-ft260.c b/drivers/hid/hid-ft260.c index 333341e80b0ec..70e2eedb465af 100644 --- a/drivers/hid/hid-ft260.c +++ b/drivers/hid/hid-ft260.c @@ -1068,10 +1068,22 @@ static int ft260_raw_event(struct hid_device *hdev, struct hid_report *report, struct ft260_device *dev = hid_get_drvdata(hdev); struct ft260_i2c_input_report *xfer = (void *)data; + if (size < offsetof(struct ft260_i2c_input_report, data)) { + hid_err(hdev, "short report %d\n", size); + return -1; + } + if (xfer->report >= FT260_I2C_REPORT_MIN && xfer->report <= FT260_I2C_REPORT_MAX) { - ft260_dbg("i2c resp: rep %#02x len %d\n", xfer->report, - xfer->length); + ft260_dbg("i2c resp: rep %#02x len %d size %d\n", + xfer->report, xfer->length, size); + + if (xfer->length > size - + offsetof(struct ft260_i2c_input_report, data)) { + hid_err(hdev, "report %#02x: length %d exceeds HID report size\n", + xfer->report, xfer->length); + return -1; + } if ((dev->read_buf == NULL) || (xfer->length > dev->read_len - dev->read_idx)) { -- 2.53.0