Re: [Xen-devel] [PATCH] libxl: handle null lists in libxl_string_list_length

[Matthew Daley <mattjd@xxxxxxxxx>]

On Sat, Sep 28, 2013 at 12:08 AM, Boris Ostrovsky
<boris.ostrovsky@xxxxxxxxxx> wrote:
>
> ----- mattjd@xxxxxxxxx wrote:
>
>> After commit b0be2b12 ("libxl: fix libxl_string_list_length and its
>> only
>> caller") libxl_string_list_length no longer handles null (empty)
>> lists. Fix
>> so they are handled, returning length 0.
>>
>> While at it, remove the unneccessary undereferenced null pointer
>> check
>
> Are you sure this check should be removed? This routine can be called
> from anywhere (at least within libxl it seems) and one day someone will
> call it with NULL argument.
>
> I'd probably leave this check in.

I would argue that any such invocation would be an error by the caller
and should fail noisily, similar to how passing NULL into strlen
should not return 0. libxl_{string,key_value}_list_dispose similarly
assumes non-NULL pointers, FWIW.

Ian C., do you have an opinion either way?

- Matthew

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