linux-kernel - re: memremap: change devm_memremap_pages interface to use struct dev

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Date:   Sat, 30 Jun 2018 22:11:41 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Christoph Hellwig <hch@....de>, linux-nvdimm@...ts.01.org
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: re: memremap: change devm_memremap_pages interface to use struct
 dev_pagemap

Hi,

static analysis with CoverityScan detected an issue with the following
commit:

commit e8d5134833006a46fcbefc5f4a84d0b62bd520e7
Author: Christoph Hellwig <hch@....de>
Date:   Fri Dec 29 08:54:05 2017 +0100

    memremap: change devm_memremap_pages interface to use struct dev_pagemap

247        }
248
   CID 1464431 (#1 of 1): Unchecked return value (CHECKED_RETURN)
check_return: Calling devm_add_action without checking return value (as
is done elsewhere 33 out of 35 times).

249        devm_add_action(dev, devm_memremap_pages_release, pgmap);
250
251        return __va(res->start);

devm_add_action can fail and return -ENOMEM because it calls
devres_alloc which can fail in an out of memory situation. So I believe
it may be pertinent to add a -ENOMEM check and clean up appropriately.
I'm not sure of the correct way to perform the error clean up, so I'm
sending this report instead of a fix.

Colin