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Sun, 17 May 2026 06:52:22 -0700 (PDT) From: Jinmo Yang To: linux-input@vger.kernel.org Cc: jikos@kernel.org, benjamin.tissoires@redhat.com, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Jinmo Yang Subject: [PATCH 2/4] HID: wacom: validate report length for DTU handler Date: Sun, 17 May 2026 22:52:13 +0900 Message-ID: <20260517135215.2220117-3-jinmo44.yang@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260517135215.2220117-1-jinmo44.yang@gmail.com> References: <20260517135215.2220117-1-jinmo44.yang@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 wacom_dtu_irq() accesses fixed offsets up to data[7] in the raw HID report buffer without validating the buffer length. This sub-function is called from wacom_wac_irq() which receives the length parameter but does not pass it to the handler. A malicious USB device can declare a small HID report in its descriptor and send a matching short report that passes the HID core size check (csize >= rsize), but the driver assumes a full-size hardware report layout, leading to slab-out-of-bounds reads. Add a minimum length check in wacom_wac_irq() before dispatching to wacom_dtu_irq(). Fixes: c8f2edc56acf ("Input: wacom - add support for DTU2231 and DTU1631") Cc: stable@vger.kernel.org Signed-off-by: Jinmo Yang --- drivers/hid/wacom_wac.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index 6d06842b6..873d58a6d 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -3472,6 +3472,8 @@ void wacom_wac_irq(struct wacom_wac *wacom_wac, size_t len) break; case DTU: + if (len < 8) + return; sync = wacom_dtu_irq(wacom_wac); break; -- 2.53.0