[Libguestfs] [PATCH] diff: avoid potential null pointer dereference on error

[Eric Blake]

On 11/03/2017 11:19 AM, Pino Toscano wrote:
> If visit_guest() fails, then it returns a null pointer; later on,
> free_tree() is called unconditionally on the variables, thus
> dereferencing null pointers.
> 
> Thus guard the free_tree() invocations.

Would it be any better to teach free_tree() to be more free()-like by
being a no-op on NULL?

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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