linux-kernel - Re: [PATCH] exfat: fix memory leak in exfat_parse

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Message-ID: <20200603015808.GS23230@ZenIV.linux.org.uk>
Date:   Wed, 3 Jun 2020 02:58:08 +0100
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Namjae Jeon <namjae.jeon@...sung.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller@...glegroups.com, butterflyhuangxx@...il.com,
        sj1557.seo@...sung.com, stable@...r.kernel.org
Subject: Re: [PATCH] exfat: fix memory leak in exfat_parse_param()

On Wed, Jun 03, 2020 at 10:29:57AM +0900, Namjae Jeon wrote:

> exfat_free() should call exfat_free_iocharset() after stealing
> param->string instead of kstrdup in exfat_parse_param().

ITYM
	extfat_free() should call exfat_free_iocharset(), to prevent
a leak in case we fail after parsing iocharset= but before calling
get_tree_bdev()

	Additionally, there's no point copying param->string in
exfat_parse_param() - just steal it, leaving NULL in param->string.
That's independent from the leak or fix thereof - it's simply
avoiding an extra copy.