linux-kernel - Re: [PATCH] staging: mt29f_spinand: fix memory leak while programming pages

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Message-ID: <CALtPoQA7EdUDmN26Z406J6gFFx4XLUy1zTb65x8MgTVpoG57tg@mail.gmail.com>
Date:   Thu, 2 Aug 2018 11:42:30 +0800
From:   Jheng-Jhong Wu <goodwater.wu@...il.com>
To:     dan.carpenter@...cle.com
Cc:     devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: mt29f_spinand: fix memory leak while programming pages

Dear Dan,

I know what you wrote, but before the spinand device is removed and
freed memory automatically, programming pages may do many many times.
Assume we erase and rewrite a large part of the flash, then
spinand_program_page() might exhaust memory if memory is not large
enough.
In fact, OOM indeed occured when I tested programming multi-pages by
mtd_debug tool.
If OOM was not caused by devm_kzalloc() in spinand_program_page(),
what may exhaust memory?

Best Regards,
─────────────────────────
Jheng-Jhong Wu (Victor Wu)
E-mail: goodwater.wu@...il.com
─────────────────────────