c - Weird crash with pointers / malloc() on if check of the pointer value -

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I have some very strange accident here, Ive got it first, but I thought I had it = announcements: 

  #include & lt; Stdlib.h & gt; ... glutton * tx = null; Integer TEX_MEMSIZE = size (glut) * 1024 * 1024; ... some zero (1) () {... TEX = (glutton *) Molk (TEX_MEMSIZE); ...} some 2 zeros () {... // This line is going fine. If (tex! = Null) {// crash on this line code / / do not move anything after the line above Free (TEX); } // ... and even since it crashed ... ...}

It crashes on my laptop / Vista, but my desktop Not on computer / winXP

When I remove it, check and free (), it does not crash anymore.

I do not take it, what's wrong? What could be the cause of this? I can only mis-predefined arrays for the reason of some inconsistency errors, I believe there are no such bad eras in my code, so I am waiting for more ideas. (And because checking of 20k lines of code can also be quite slow)

Edit: Now I have seen that it will not crash before free () but after that I started thinking of some of my predefined array problems ... because the crash situation is changing. (Or I just have dementia).

Edit 2: Fixed, there were two free () calls, before and after malloc ()> _> I was feeling so stupid now

How is TEX_MEMSIZE defined?

It should be something like: 

  #define NUM_ENTRIES 50 # Define TEX_MEMSIZE NUM_ENTRIES * Size (GLuint)
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