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Wed, 04 Feb 2026 05:31:41 -0800 (PST) Received: from laptok ([2a00:f41:4842:718a:3ac6:8cea:3b72:7d9d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43617e3a546sm7614237f8f.17.2026.02.04.05.31.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Feb 2026 05:31:40 -0800 (PST) From: =?UTF-8?q?Tomasz=20Paku=C5=82a?= To: jikos@kernel.org, bentiss@kernel.org Cc: oleg@makarenk.ooo, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, tomasz.pakula.oficjalny@gmail.com Subject: [PATCH v2] HID: pidff: Fix condition effect bit clearing Date: Wed, 4 Feb 2026 14:31:38 +0100 Message-ID: <20260204133138.475880-1-tomasz.pakula.oficjalny@gmail.com> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable As reported by MPDarkGuy on discord, NULL pointer dereferences were happening because not all the conditional effects bits were cleared. Properly clear all conditional effect bits from ffbit Fixes: 7f3d7bc0df4b ("HID: pidff: Better quirk assigment when searching for= fields") Cc: # 6.18.x Signed-off-by: Tomasz Paku=C5=82a --- Urgent for 6.19 rc period V1 -> V2: Simplify by using bitwise or operator drivers/hid/usbhid/hid-pidff.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/hid/usbhid/hid-pidff.c b/drivers/hid/usbhid/hid-pidff.c index a4e700b40ba9..792992c69837 100644 --- a/drivers/hid/usbhid/hid-pidff.c +++ b/drivers/hid/usbhid/hid-pidff.c @@ -1452,9 +1452,10 @@ static int pidff_init_fields(struct pidff_device *pi= dff, struct input_dev *dev) hid_warn(pidff->hid, "unknown ramp effect layout\n"); =20 if (PIDFF_FIND_FIELDS(set_condition, PID_SET_CONDITION, 1)) { - if (test_and_clear_bit(FF_SPRING, dev->ffbit) || - test_and_clear_bit(FF_DAMPER, dev->ffbit) || - test_and_clear_bit(FF_FRICTION, dev->ffbit) || + /* Bitwise to ensure all the bits will be cleared */ + if (test_and_clear_bit(FF_SPRING, dev->ffbit) | + test_and_clear_bit(FF_DAMPER, dev->ffbit) | + test_and_clear_bit(FF_FRICTION, dev->ffbit) | test_and_clear_bit(FF_INERTIA, dev->ffbit)) hid_warn(pidff->hid, "unknown condition effect layout\n"); } --=20 2.52.0