From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9D8B3248BB0; Wed, 15 Jan 2025 10:59:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736938778; cv=none; b=b/DYNIfji88dt4KKxOYimmqmw9x+IHPjL8aJSkPIADnpOLp1Oe00lxF/8U/JjObwXG9MCOwJ5xxDsN8YuFy4wMo+dMjcPA70kA4mo3WE0BVcfd0jI2L8kmm4SNqQJ8VMTIyoM2ogWGxXll4+T6oLGkD1oHsVciEwLDvE4rrlUU4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736938778; c=relaxed/simple; bh=8g9X/gIc/c0Kny34xVLDrQg6dekXty3jwHoAL1mRE5Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=DIqOCSHqgp7w2Av6drFD884EIyMLSFZUv9sHaKKvgv7lROiCJx22TT/ad6mJmJQVs6Qy7CobC87QCssCw0jDe1gJIr90oWKhGcaZ6uLltTIPVGJoTtCRkGC+U+1uXGJkmjEdrzrlF6WJr14ufnWk5JVTfLa5mAmEpRiYT+8DwDY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fQcTNiMJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fQcTNiMJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B9831C4CEE2; Wed, 15 Jan 2025 10:59:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1736938778; bh=8g9X/gIc/c0Kny34xVLDrQg6dekXty3jwHoAL1mRE5Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fQcTNiMJP/8eBB1kQm3EnpMZUdWpK4DST4gvtr+Sxl/ZCuYR3/9opIiuWQyPgfPXr HTFKWLSKdTNUPSrndVkquLlnYZglDzkN2UpAyRGRorfWJEGAouyz9+/tjLzjqBvIZv Qx1wLmENnfyM0/41bLix4WkhJsbCOsrpgj5/2lio= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Ma Ke , Alan Stern Subject: [PATCH 6.6 095/129] usb: fix reference leak in usb_new_device() Date: Wed, 15 Jan 2025 11:37:50 +0100 Message-ID: <20250115103558.155858324@linuxfoundation.org> X-Mailer: git-send-email 2.48.0 In-Reply-To: <20250115103554.357917208@linuxfoundation.org> References: <20250115103554.357917208@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ma Ke commit 0df11fa8cee5a9cf8753d4e2672bb3667138c652 upstream. When device_add(&udev->dev) succeeds and a later call fails, usb_new_device() does not properly call device_del(). As comment of device_add() says, 'if device_add() succeeds, you should call device_del() when you want to get rid of it. If device_add() has not succeeded, use only put_device() to drop the reference count'. Found by code review. Cc: stable Fixes: 9f8b17e643fe ("USB: make usbdevices export their device nodes instead of using a separate class") Signed-off-by: Ma Ke Reviewed-by: Alan Stern Link: https://lore.kernel.org/r/20241218071346.2973980-1-make_ruc2021@163.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -2633,13 +2633,13 @@ int usb_new_device(struct usb_device *ud err = sysfs_create_link(&udev->dev.kobj, &port_dev->dev.kobj, "port"); if (err) - goto fail; + goto out_del_dev; err = sysfs_create_link(&port_dev->dev.kobj, &udev->dev.kobj, "device"); if (err) { sysfs_remove_link(&udev->dev.kobj, "port"); - goto fail; + goto out_del_dev; } if (!test_and_set_bit(port1, hub->child_usage_bits)) @@ -2651,6 +2651,8 @@ int usb_new_device(struct usb_device *ud pm_runtime_put_sync_autosuspend(&udev->dev); return err; +out_del_dev: + device_del(&udev->dev); fail: usb_set_device_state(udev, USB_STATE_NOTATTACHED); pm_runtime_disable(&udev->dev);