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Fri, 05 Jun 2026 21:03:49 -0700 (PDT) Received: from haichao.tail057a43.ts.net ([2001:da8:e000:1206:967f:7ce4:ec98:f08b]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-842828e02f9sm10782031b3a.48.2026.06.05.21.03.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 05 Jun 2026 21:03:49 -0700 (PDT) From: Ruoyu Wang To: Ping Cheng Cc: Jason Gerecke , Jiri Kosina , Benjamin Tissoires , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Ruoyu Wang Subject: [PATCH] HID: wacom: handle kmemdup failure in Bluetooth IRQ path Date: Sat, 6 Jun 2026 12:03:44 +0800 Message-ID: <20260606040344.4-1-ruoyuw560@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" wacom_intuos_bt_irq() duplicates the input report with kmemdup() and then uses data[0] to dispatch the report type. If the allocation fails, the switch statement dereferences a NULL pointer. Handle allocation failure by dropping the report. This keeps the interrupt path from dereferencing a NULL buffer while preserving the existing return convention for ignored or malformed reports. Signed-off-by: Ruoyu Wang --- drivers/hid/wacom_wac.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index da1f0ea85625d..c42af15e7dba0 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -1206,6 +1206,9 @@ static int wacom_intuos_bt_irq(struct wacom_wac *waco= m, size_t len) int i =3D 1; unsigned power_raw, battery_capacity, bat_charging, ps_connected; =20 + if (!data) + return 0; + switch (data[0]) { case 0x04: if (len < 32) { --=20 2.34.1