linux-kernel - Re: [PATCH] lib/string_helpers.c: fix infinite loop in string_get

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Message-Id: <20150910160815.30d56ee48bbfdf5eed783c53@linux-foundation.org>
Date:	Thu, 10 Sep 2015 16:08:15 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	James Bottomley <JBottomley@...n.com>,
	linux-kernel@...r.kernel.org,
	"K. Y. Srinivasan" <kys@...rosoft.com>
Subject: Re: [PATCH] lib/string_helpers.c: fix infinite loop in
 string_get_size()

On Fri,  4 Sep 2015 14:56:33 +0200 Vitaly Kuznetsov <vkuznets@...hat.com> wrote:

> string_get_size(1, 512, 0, ..., ...) call results in an infinite loop. The
> problem is that if size == 0 when we start calculating sf_cap this loop
> will never end.
> 
> The caller causing the issue is sd_read_capacity(), the problem was noticed
> on Hyper-V.

When fixing bugs, please provide enough info for others to be able to
understand which kernel version(s) need the fix.  In this case: what
end-user action triggers this bug?  (iow, how does sdkp->capacity
become zero?)




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