https://bz.apache.org/bugzilla/show_bug.cgi?id=61294
Bug ID: 61294
Summary: IOUtils.skipFully can run into infinite loop
Product: POI
Version: 3.16-dev
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: POI Overall
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Luis Filipe Nassif, over on TIKA-2428, reported that the EMFParser can hit an
infinite loop on corrupt files. IOUtils.skipfully can run into an infinite
loop.
We need to change readSoFar to a long to avoid overflow; we need to account for
FileInputStream alleging that it skipped more bytes than were available; and we
need to account for an InputStream returning 0, which can happen for a) because
it wanted to but there are still bytes available() or b) it hit the end of the
InputStream. In the last case, where bytes are available and the full length
has not been skipped, we need to fallback to read() to make sure read doesn't
hit a -1.
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