Make sure that read is complete to prevent infinite loop #1788
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Fixes: GHSA-9jh3-fcc3-g6hv
The problem is that an incomplete read on line 639 can cause the code to get confused about its position in the file, leading to an infinite loop. The fix is to check that the read is compelte.
This function has at least one other bug which I will fix in a separate pull request.