[Nouveau] [Bug 68456] [NV4B] null deref on load, NvI2C=1 makes it work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68456

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
The code decodes to

  1c:   51                      push   %rcx
  1d:   48 8b 47 18             mov    0x18(%rdi),%rax
  21:   48 8b 38                mov    (%rax),%rdi
  24:   48 8b 87 50 03 00 00    mov    0x350(%rdi),%rax
  2b:*  48 8b 00                mov    (%rax),%rax              <-- trapping
instruction
  2e:   48 85 c0                test   %rax,%rax
  31:   74 02                   je     0x35
  33:   ff d0                   callq  *%rax
  35:   31 c0                   xor    %eax,%eax
  37:   5a                      pop    %rdx
  38:   c3                      retq   

Which means that port->func is NULL. Still trying to work out exactly how that
happens.

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