2017.06.27 22:52 "Re: [Tiff] Excessive memory allocation while chopping strips", by Even Rouault

On mardi 27 juin 2017 18:43:27 CEST Olivier Paquet wrote:

2017-06-27 18:08 GMT-04:00 Even Rouault <even.rouault@spatialys.com>:

But indeed you raise a more general problem. libtiff may allocate in various places enormous virtual memory for very short files. I've tried workarounding a few situations at application level in GDAL,

Could you explain why that is a problem?

Fuzzers (specifically the address sanitizer) crash on this situations, assuming that attempts of huge memory allocations are a bug. libtiff itself will not crash (or it is a real bug) if a malloc() fails, but this isn't a good practice to attempt allocating a lot of memory if it is not needed. And indeed the files processed by fuzzers are just a few kilobytes large at most.

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