Public bug reported:

1) Ubuntu 16.04.1 LTS
2) libtiff5-dev
3) Reading a tiff (RGB, 32 bits per pixel), the tiff has "extra samples" tag. 
The next code should return number of extra samples:

uint16 m;
TIFFGetField(tif, TIFFTAG_EXTRASAMPLES, &m);

4) The above code gives "Segmentation fault" when reading this tag exactly, 
other tags can be read.
An old 3.x version didn't have this issue, verified with the same file.

** Affects: tiff (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "LUC 1.tif"
   
https://bugs.launchpad.net/bugs/1643071/+attachment/4779604/+files/LUC%201.tif

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https://bugs.launchpad.net/bugs/1643071

Title:
  Segmentation fault for EXTRASAMPLES

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