linux-kernel - Re: [PATCH] ima: Fix memory leak in __ima_inode

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Date:   Wed, 02 Nov 2022 18:04:55 -0400
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Roberto Sassu <roberto.sassu@...weicloud.com>,
        dmitry.kasatkin@...il.com, paul@...l-moore.com, jmorris@...ei.org,
        serge@...lyn.com
Cc:     linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, isaac.jmatt@...il.com,
        Roberto Sassu <roberto.sassu@...wei.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] ima: Fix memory leak in __ima_inode_hash()

Hi Roberto,

On Wed, 2022-11-02 at 17:30 +0100, Roberto Sassu wrote:
> From: Roberto Sassu <roberto.sassu@...wei.com>

Any chance you could fix your mailer?

> 
> Commit f3cc6b25dcc5 ("ima: always measure and audit files in policy") lets
> measurement or audit happen even if the file digest cannot be calculated.
> 
> As a result, iint->ima_hash could have been allocated despite
> ima_collect_measurement() returning an error.
> 
> Since ima_hash belongs to a temporary inode metadata structure, declared
> at the beginning of __ima_inode_hash(), just add a kfree() call if
> ima_collect_measurement() returns an error different from -ENOMEM (in that
> case, ima_hash should not have been allocated).
> 
> Cc: stable@...r.kernel.org
> Fixes: 280fe8367b0d ("ima: Always return a file measurement in ima_file_hash()")
> Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>

Thanks,

Reviewed-by: Mimi Zohar <zohar@...ux.ibm.com>