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July 2007

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2007.07.13 18:14 "Read warnings in TIFFReadEncodedStrip lead to crash on TIFFClose", by Steve Bougerolle

2007.07.16 11:51 "Re: Read warnings in TIFFReadEncodedStrip lead to crash onTIFFClose", by Joris Van Damme

2007.07.13 18:14 "Read warnings in TIFFReadEncodedStrip lead to crash on TIFFClose", by Steve Bougerolle

We've run into an obscure bug/feature:  when reading some specific TIFF
files
Fax4Decode (called from TIFFReadEncodedStrip) will toss out a few warnings
about "line length mismatch" and continue reading.  However, farther down
the
line the program segfaults while doing TIFFClose().

The program seems to be doing everything right that I can see - reading the
fields
in the right order, checking error return values.  The problem is libtiff
only DISPLAYS
this warning but doesn't return any error code.  If this can cause a
segfault, surely it
needs to be classed as an error?

Adding "return -1" to the CLEANUP_RUNS macro in libtiff/tif_fax3.h seems to
fix the
problem.