linux-kernel - Re: [PATCH] security:trusted_tpm2: Fix memory leak in tpm2_key

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Message-ID: <Yp8j9FilcBMyeL2G@iki.fi>
Date:   Tue, 7 Jun 2022 13:09:56 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Jianglei Nie <niejianglei2021@....com>
Cc:     jejb@...ux.ibm.com, zohar@...ux.ibm.com, dhowells@...hat.com,
        jmorris@...ei.org, serge@...lyn.com,
        linux-integrity@...r.kernel.org, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] security:trusted_tpm2: Fix memory leak in
 tpm2_key_encode()

"KEYS: trusted: fix memory leak in tpm2_key_encode()"

On Tue, Jun 07, 2022 at 03:46:50PM +0800, Jianglei Nie wrote:
> The function allocates a memory chunk for scratch by kmalloc(), but
                                        ~~~         ~~ 
                                        from        with

There's more than one function in Linux - maybe you'd rather want
to write: "tpm2_key_encode() allocates ..."

> it is never freed through the function, which leads to a memory leak.

You can just write "it is never freed, which leads to a memory leak."

> Handle those cases with kfree().

"Free the memory chunk with kfree() in the return paths."

> Signed-off-by: Jianglei Nie <niejianglei2021@....com>

Thank you finding this and providing a fix, it is highly appreciated.
Please don't take the nitpicking with the language personally. Just want
to have it documented in appropriate form.

BR, Jarkko