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[31.26.70.91]) by smtp.googlemail.com with ESMTPSA id 5b1f17b1804b1-49d1fd532dcsm123568545e9.1.2026.09.10.08.11.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2026 08:11:05 -0700 (PDT) From: Oleg Keri To: "Derek J. Clark" , Mark Pearson , Jiri Kosina , Benjamin Tissoires , Hans de Goede , Bernhard Seibold Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] HID: lenovo: allocate the trackpoint drvdata before exposing its sysfs attributes Date: Thu, 10 Sep 2026 17:10:51 +0200 Message-ID: <20260910151051.12975-3-okerixx@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260910151051.12975-1-okerixx@gmail.com> References: <20260910151051.12975-1-okerixx@gmail.com> Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit lenovo_probe_tpkbd() creates its sysfs group before allocating the lenovo_drvdata that every attribute handler dereferences through hid_get_drvdata(), and drvdata is explicitly NULL at that point. A read of e.g. the sensitivity attribute between the two steps is a NULL pointer dereference. Allocate and install the drvdata first, then create the group. The allocation failure path no longer has a group to remove, so it returns directly. Fixes: c1dcad2d32d0 ("HID: Driver for Lenovo Keyboard with Trackpoint") Link: https://lore.kernel.org/all/20260910064345.9BF1E1F000FF@smtp.kernel.org/ Signed-off-by: Oleg Keri --- 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/hid/hid-lenovo.c b/drivers/hid/hid-lenovo.c index ff7c5ef..62bb805 100644 --- a/drivers/hid/hid-lenovo.c +++ b/drivers/hid/hid-lenovo.c @@ -1253,17 +1253,12 @@ static int lenovo_probe_tpkbd(struct hid_device *hdev) if (!hid_validate_values(hdev, HID_OUTPUT_REPORT, 3, 0, 2)) return -ENODEV; - ret = sysfs_create_group(&hdev->dev.kobj, &lenovo_attr_group_tpkbd); - if (ret) - hid_warn(hdev, "Could not create sysfs group: %d\n", ret); - data_pointer = devm_kzalloc(&hdev->dev, sizeof(struct lenovo_drvdata), GFP_KERNEL); if (data_pointer == NULL) { hid_err(hdev, "Could not allocate memory for driver data\n"); - ret = -ENOMEM; - goto err; + return -ENOMEM; } // set same default values as windows driver @@ -1272,6 +1267,10 @@ static int lenovo_probe_tpkbd(struct hid_device *hdev) hid_set_drvdata(hdev, data_pointer); + ret = sysfs_create_group(&hdev->dev.kobj, &lenovo_attr_group_tpkbd); + if (ret) + hid_warn(hdev, "Could not create sysfs group: %d\n", ret); + ret = lenovo_register_leds(hdev); if (ret) goto err; -- 2.55.0