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Fri, 23 Oct 2026 20:30:53 -0700 (PDT) Received: from jmoon.tail8e743c.ts.net ([118.220.156.4]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-369e8ecf087sm2827283eec.27.2026.10.23.20.30.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2026 20:30:53 -0700 (PDT) From: Jinmo Yang To: ping.cheng@wacom.com, jason.gerecke@wacom.com, jikos@kernel.org, bentiss@kernel.org Cc: dmitry.torokhov@gmail.com, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Jinmo Yang Subject: [PATCH v4 3/6] HID: wacom: add NULL input guards to wacom_intuos_irq() and its helpers Date: Sat, 24 Oct 2026 12:30:37 +0900 Message-ID: <20261024033040.316652-4-jinmo44.yang@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20261024033040.316652-1-jinmo44.yang@gmail.com> References: <20260927041138.4112920-1-jinmo44.yang@gmail.com> <20261024033040.316652-1-jinmo44.yang@gmail.com> X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit wacom_intuos_irq() assigns pen_input to a local variable and dereferences it in a dev_dbg() before any NULL check. Its helpers wacom_intuos_inout() and wacom_intuos_general() also dereference pen_input unconditionally. Add a pen_input NULL guard at the top of wacom_intuos_irq() to protect them all. wacom_intuos_pad() uses pad_input throughout, but pad_input can be NULL when wacom_setup_pad_input_capabilities() returns -ENODEV during a successful probe. Add a NULL guard after the report-ID check. Adopt the same return convention as wacom_intuos_inout() and wacom_intuos_general(): return 1 for "handled, don't sync" and 2 for "handled, sync". Update wacom_intuos_irq() to apply the matching "result - 1" transform so that the NULL-guard path (return 1) suppresses the spurious input_sync() that the old "return 1" would have triggered via wacom_wac_irq(). Fixes: 10059cdc0ad0 ("Input: wacom - split out the pad device for Intuos/Cintiq") Signed-off-by: Jinmo Yang Co-Authored-By: Claude Opus 4.6 --- drivers/hid/wacom_wac.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/hid/wacom_wac.c b/drivers/hid/wacom_wac.c index bec8dbec5bc3..c38fbec114e4 100644 --- a/drivers/hid/wacom_wac.c +++ b/drivers/hid/wacom_wac.c @@ -581,6 +581,12 @@ static int wacom_intuos_pad(struct wacom_wac *wacom) data[0] == WACOM_REPORT_CINTIQPAD)) return 0; + if (!input) { + dev_warn_once(&container_of(wacom, struct wacom, wacom_wac)->hdev->dev, + "%s: pad_input is NULL\n", __func__); + return 1; /* handled; the -1 in wacom_intuos_irq() suppresses sync */ + } + if (features->type >= INTUOS4S && features->type <= INTUOS4L) { buttons = (data[3] << 1) | (data[2] & 0x01); ring1 = data[1]; @@ -716,7 +722,7 @@ static int wacom_intuos_pad(struct wacom_wac *wacom) input_event(input, EV_MSC, MSC_SERIAL, 0xffffffff); - return 1; + return 2; } static int wacom_intuos_id_mangle(int tool_id) @@ -1073,6 +1079,12 @@ static int wacom_intuos_irq(struct wacom_wac *wacom) struct input_dev *input = wacom->pen_input; int result; + if (!input) { + dev_warn_once(&container_of(wacom, struct wacom, wacom_wac)->hdev->dev, + "%s: pen_input is NULL\n", __func__); + return 0; + } + if (data[0] != WACOM_REPORT_PENABLED && data[0] != WACOM_REPORT_INTUOS_ID1 && data[0] != WACOM_REPORT_INTUOS_ID2 && @@ -1089,7 +1101,7 @@ static int wacom_intuos_irq(struct wacom_wac *wacom) /* process pad events */ result = wacom_intuos_pad(wacom); if (result) - return result; + return result - 1; /* process in/out prox events */ result = wacom_intuos_inout(wacom); -- 2.53.0