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The error_report() call in drc_unisolate_logical() is not considering that drc->dev->id can be NULL, and the underlying functions error_report() calls to do its job (vprintf(), g_strdup_printf() ...) has undefined behavior when trying to handle "%s" with NULL arguments. Besides, there is no utility into reporting that an unknown device was rejected by the guest. Acked-by: David Gibson <david@gibson.dropbear.id.au> Reviewed-by: Greg Kurz <groug@kaod.org> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20210907004755.424931-4-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>