[Rpm-maint] [rpm-software-management/rpm] pgpGet(): check that the returned length is in bounds (#1706)

[Demi Marie Obenour]

This will be used to replace incorrect checks in the calling code.
The new pgpGet() avoids undefined pointer arithmetic, too.  One
call-site of pgpGet() is broken by this change, so replace it with a
direct bounds-check.
You can view, comment on, or merge this pull request online at:

  https://github.com/rpm-software-management/rpm/pull/1706

-- Commit Summary --

  * pgpGet(): check that the returned length is in bounds

-- File Changes --

    M rpmio/rpmpgp.c (43)

-- Patch Links --

https://github.com/rpm-software-management/rpm/pull/1706.patch
https://github.com/rpm-software-management/rpm/pull/1706.diff

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