netdev - Re: [PATCH v4 4/4] KEYS: Avoid false positive ENOMEM error on key read

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Message-ID: <2832139.1584520054@warthog.procyon.org.uk>
Date:   Wed, 18 Mar 2020 08:27:34 +0000
From:   David Howells <dhowells@...hat.com>
To:     Waiman Long <longman@...hat.com>
Cc:     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 v4 4/4] KEYS: Avoid false positive ENOMEM error on key read

Waiman Long <longman@...hat.com> wrote:

> +static inline void __kvzfree(const void *addr, size_t len)
> +{
> +	if (addr) {
> +		memset((void *)addr, 0, len);
> +		kvfree(addr);
> +	}
> +}

I wonder if that would be better as "kvfree(memset(...))" as memset() will
return the address parameter.  If memset is not inline, it avoids the need for
the compiler to save the parameter.

David