From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 646BF50B8C6; Wed, 30 Sep 2026 18:16:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792184; cv=none; b=IePhICd5emTAZ2kakqLq2EU5+Med9tDVd/y/ZOQV2UkLSe1+w+Vn5+Sxsth73sW5GRNM+aOZ30MCuf8z2JrxDA3TXO9BFuehb/9UeX5TBVDTbKH+FMzqD2jHLK4jgjv1COj5oARu6gkqbsm6vmpVHmAMD/Yy2okYMXI6sWOKoIY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792184; c=relaxed/simple; bh=Nwnhl1pa9N0wOcSCCvj8hCqJncRNhJUdmvCCv9xDpbc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S1PFVZhpBPb8ie7sNvgfBGm4eel3pbDTCnXSQvfchetAkOcEm5n45vNN8BML5Inuko+LjAZWUwFx8dZYAUl+P3dUxUFUGjpu5uzwGqqbFrx/OOHzBqBkgX2EMIg/AK0xV5KOCetdQ4n9xwkPap4z6EvtdBNIHggy5mKi9daIgo8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=BsHWZy4a; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="BsHWZy4a" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BDFE81F000FF; Wed, 30 Sep 2026 18:16:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790792183; bh=WSE579FpBNWZai4sLqbVfhCdzmBJDQOsHchnkxZCEIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=BsHWZy4aueGvhyqoTEnio16O7cr3BX59SGgXA43S10yCdGMHvQG7j1S+xnNNCuoke 8y6bS4outD1sRS9+k7jYV2jrkDS3RechIsnM2Bgq41bNzJ5FIYQW5wuOpD+h53b4LI 4zZ9DOepaLksIELfLA86LKwWocFzbRbkSt9vV+Bw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Guangshuo Li , Guenter Roeck Subject: [PATCH 5.15 566/752] hwmon: (w83793) release probe data through kref Date: Wed, 30 Sep 2026 17:27:16 +0200 Message-ID: <20260930152410.485297580@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Guangshuo Li commit c702a5f18b780e477eccbbab558e590e9673e4cb upstream. w83793_probe() initializes data->kref to manage the lifetime of the driver data. The normal remove path drops the driver-owned reference with kref_put(), while watchdog users take and release additional references through the same kref. However, the probe error path still frees data directly with kfree(). This bypasses the kref-managed lifetime and discards the initial reference without a matching kref_put(), leaving the reference accounting unbalanced. Drop the probe-owned reference with kref_put() instead and let w83793_release_resources() perform the final free, matching the normal remove path. This issue was found by manual code inspection. Fixes: 5852f9609d21 ("hwmon: (w83793) Add watchdog functionality") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li Link: https://patch.msgid.link/20260914073638.1662500-1-lgs201920130244@gmail.com Signed-off-by: Guenter Roeck Signed-off-by: Greg Kroah-Hartman --- drivers/hwmon/w83793.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/hwmon/w83793.c +++ b/drivers/hwmon/w83793.c @@ -1931,7 +1931,9 @@ exit_remove: for (i = 0; i < ARRAY_SIZE(w83793_temp); i++) device_remove_file(dev, &w83793_temp[i].dev_attr); free_mem: - kfree(data); + mutex_lock(&watchdog_data_mutex); + kref_put(&data->kref, w83793_release_resources); + mutex_unlock(&watchdog_data_mutex); exit: return err; }