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The test file on this bug:
de53b4bd41191f02d01a3c39b4880fa8_asan_heap-oob_caba3c_9561_7427.pdf
includes a corrupt CMAP. When this is read into memory it produces
a CMAP where the table gets too large. This produces lots of warnings
from 'add_table', but the calls to add_table all assume that the
process completed fine, resulting in range entries being added
that point to nonexistent values.
The fix is to make add_table return a bool to indicate success or
failure, and to only add range entries if the add_table succeeds.
Thanks to Mateusz Jurczyk and Gynvael Coldwind of the Google Security
Team for providing the example files.
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