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Created attachment 1163869 [details]
simple demo of incorrect result by copying static function into standalone program

Description of problem:

base64_decode_value() in rpmio/base64.c incorrectly uses > instead of >= when bounds checking array.  This leads to base64_decode_value(123) 
returning a garbage value rather than -1.


Version-Release number of selected component (if applicable):

Present in all versions.


How reproducible:

100%


Steps to Reproduce:

Attached file demonstrates the function's incorrect result (should be -1, result is instead arbitrary).


Additional info:

See upstream bug https://github.com/rpm-software-management/rpm/pull/68

Originally disclosed by jwakely to secalert@ as a potential security issue.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2160