mainline inclusion
from mainline-5.7
commit 008f1d60
category: bugfix
bugzilla: NA
CVE: NA

-------------------------------------------------

Sathyanarayanan reported that the PCI-E AER error injection mechanism
can result in a NULL pointer dereference in apic_ack_edge():

 BUG: unable to handle kernel NULL pointer dereference at 0000000000000078
 RIP: 0010:apic_ack_edge+0x1e/0x40
 Call Trace:
   handle_edge_irq+0x7d/0x1e0
   generic_handle_irq+0x27/0x30
   aer_inject_write+0x53a/0x720

It crashes in irq_complete_move() which dereferences get_irq_regs() which
is obviously NULL when this is called from non interrupt context.

Of course the pointer could be checked, but that just papers over the real
issue. Invoking the low level interrupt handling mechanism from random code
can wreckage the fragile interrupt affinity mechanism of x86 as interrupts
can only be moved in interrupt context or with special care wh...