netdev - Re: [PATCH v7 2/2] KEYS: Avoid false positive ENOMEM error on key read

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Message-ID: <03c0c59e-a84b-bd75-6b3f-7f6467d806e2@redhat.com>
Date:   Sat, 21 Mar 2020 20:46:33 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:     David Howells <dhowells@...hat.com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>,
        Mimi Zohar <zohar@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-integrity@...r.kernel.org, netdev@...r.kernel.org,
        linux-afs@...ts.infradead.org, Sumit Garg <sumit.garg@...aro.org>,
        Jerry Snitselaar <jsnitsel@...hat.com>,
        Roberto Sassu <roberto.sassu@...wei.com>,
        Eric Biggers <ebiggers@...gle.com>,
        Chris von Recklinghausen <crecklin@...hat.com>
Subject: Re: [PATCH v7 2/2] KEYS: Avoid false positive ENOMEM error on key
 read

On 3/21/20 8:31 PM, Tetsuo Handa wrote:
> On 2020/03/22 3:49, Waiman Long wrote:
>> +	do {
>> +		if (ret > key_data_len) {
>> +			if (unlikely(key_data))
>> +				__kvzfree(key_data, key_data_len);
>> +			key_data_len = ret;
>> +			continue;	/* Allocate buffer */
> Excuse me, but "continue;" inside "do { ... } while (0);" means "break;"
> because "while (0)" is evaluated before continuing the loop.

You are right. My mistake. Will send out a new one for patch 2.

-Longman