[BUG] x86: apic: Possible null pointer dereference by apic_ack_edge

[William Breathitt Gray]

Hello,

In mainline kernel version 4.3-rc4, the following line located in the
apic_ack_edge function definition can result in a null pointer dereference:

        irq_complete_move(irqd_cfg(data));
        
The irqd_cfg function may return a value of NULL. If NULL is passed to the
irq_complete_move function, then the struct apic_chip_data pointer 'data' of
the __irq_complete_move function will be defined, and subsequently dereferenced,
based on this incorrect NULL value passed through the 'cfg' parameter:

        data = container_of(cfg, struct apic_chip_data, cfg);
        if (likely(!data->move_in_progress))
        
Sincerely,

William Breathitt Gray
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