Re: [Xen-devel] [PATCH RFC] xen/common: Do not tolerate xmalloc(0, ...)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 31.03.15 at 17:57, <andrew.cooper3@xxxxxxxxxx> wrote:
> Currently, _xmalloc() supports zero-sized allocations by returning a sentinel
> poisoned pointer.
> 
> I posit that there are no legitimate situation for any code in the 
> hypervisor
> to make a zero sized allocation.

I'm afraid there are, and we ran into them (I vaguely recall with an
earlier version of this patch, which tried to do something similar to
what you suggest now). I don't recall where exactly they were, but
it should have been some array allocation with zero array elements
(perhaps because some particular feature was unsupported).

And I second Tim's reply independent from the above.

Jan


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