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

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Date:   Thu, 03 Nov 2022 08:49:23 +0100
From:   Roberto Sassu <roberto.sassu@...weicloud.com>
To:     Mimi Zohar <zohar@...ux.ibm.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()

On Wed, 2022-11-02 at 18:04 -0400, Mimi Zohar wrote:
> 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?

Hi Mimi

not sure how to fix this. I need to send from @huaweicloud.com because
some people didn't receive the patches from @huawei.com. But I still
prefer to have the original email in the patches.

Thanks

Roberto

> > 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>