[PATCH] ima: Fix memory leak in __ima_inode_hash()

[Roberto Sassu]

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 at huawei.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 at vger.kernel.org
> > Fixes: 280fe8367b0d ("ima: Always return a file measurement in
> > ima_file_hash()")
> > Signed-off-by: Roberto Sassu <roberto.sassu at huawei.com>
> 
> Thanks,
> 
> Reviewed-by: Mimi Zohar <zohar at linux.ibm.com>