[Xen-devel] Hazardous memset/memcpy idiom (was Re: [PATCH] x86: fix null pointer dereference in intel_get_extended_msrs())

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Jan Beulich writes ("Hazardous memset/memcpy idiom (was Re: [Xen-devel] [PATCH] 
x86: fix null pointer dereference in intel_get_extended_msrs())"):
> Unfortunately that wouldn't be usable in all cases (arrays passed
> to functions),

 #define FILLZERO_ARRAY(arrayobj, num_elements) \
    (memset((arrayobj),0,sizeof((arrayobj)[0])*(num_elements)))

And the fact that a macro isn't universally applicable isn't a reason
not to replace an error-prone idiom in the very frequent cases where
the macro would be applicable.

Ian.

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