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Fix object reference count problem on error path in AcpiExOpcode_1A_0T_1R #685

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Fix object reference count problem on error path in AcpiExOpcode_1A_0T_1R #685

wants to merge 1 commit into from

Commits on Apr 12, 2021

  1. Fix object reference count problem on error path in AcpiExOpcode_1A_0… 

    …T_1R

Prevent an unwarranted AcpiUtRemoveReference on an attached object
in AcpiExOpcode_1A_0T_1R when AcpiExReadDataFromField returns an
error. The extra decrement of the object's reference count results
in the premature deletion of that object while it is still attached.
Any subsequent reference to that attached object becomes a use-after-
free and can result in an OS crash.

One real world example of how this error path can be encountered is
on evaluation of RefOf() a local region field where there is no
registered handler for that OpRegion.

Signed-off-by: Lenny Szubowicz <lszubowi@redhat.com>
    @LennySzubowicz
    LennySzubowicz committed Apr 12, 2021
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