linux-kernel - Re: [PATCH 1/3] bridge: Fix error path for kobject_init_and

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Date:   Tue, 30 Apr 2019 11:23:15 +1000
From:   "Tobin C. Harding" <tobin@...nel.org>
To:     "Tobin C. Harding" <tobin@...nel.org>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tyler Hicks <tyhicks@...onical.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ido Schimmel <idosch@...lanox.com>,
        Alexander Duyck <alexander.h.duyck@...el.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Wang Hai <wanghai26@...wei.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] bridge: Fix error path for kobject_init_and_add()

On Tue, Apr 30, 2019 at 10:28:15AM +1000, Tobin C. Harding wrote:

[snip]

The cover letter appears to have gotten lost, I can resend if it makes
things better for you Dave.

FTR this is the contents from it:

Hi Dave,

There are a few places in net/ that are not correctly handling the error
path after calls to kobject_init_and_add().  This set fixes all of these
for net/

This corrects a memory leak if kobject_init() is not followed by a call
to kobject_put()

This set is part of an effort to check/fix all of these mem leaks across
the kernel tree.

For reference this is the behaviour that we are trying to achieve

void fn(void)
{
	int ret;

	ret = kobject_init_and_add(kobj, ktype, NULL, "foo");
	if (ret) {
		kobject_put(kobj);
		return ret;
	}

	ret = some_init_fn();
	if (ret)
		goto err;

	ret = some_other_init_fn();
	if (ret)
		goto other_err;

	kobject_uevent(kobj, KOBJ_ADD);
	return 0;

other_err:
	other_clean_up_fn();
err:
	kobject_del(kobj);
	return ret;
}


 Testing: No testing done, built with config options

CONFIG_NET=y
CONFIG_SYSFS=y
CONFIG_BRIDGE=y


thanks,
Tobin.