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

[Mimi Zohar]

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?

> 
> 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>