RTEMS | posix/mmap: Fix validation order for map_fixed addresses (!542)

[Kinsey Moore (@opticron)]

Kinsey Moore started a new discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/542#note_126314


The pointer is not being dereferenced, so these two checks are fine in either order and produce the same result. They also happen to be mutually exclusive. A null pointer can't trip the page mask check and a pointer with the page bits set can't trip the null pointer check.

Masking off bits of a potentially-null pointer isn't undefined behavior, is it?

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/542#note_126314
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