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page fault when call free()

Posted on 1998-09-25
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Last Modified: 2013-11-19
Hi,

  I am using MSVC 5.0 and it is a Win32 console application. My program always got a page fault when it runs a while. After tracing the error, I finally find that it occurs when I call free(). However, this is very strange because this free() call is within a loop. It looks like this:

for(i=0;i<48;i++)  
  free(myPointer[i]);  // error occurs when i=18
free(myPointer);

The error occured when i = 18! I have checked myPointer's dimension and I am sure memory was successfully allocated to it. I would like to know what is the probable cause for this problem, or is it a bug of VC?

Any help is appreciated.

wyldsj
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Question by:wyldsj
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2 Comments
 
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Accepted Solution

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Norbert earned 100 total points
ID: 1322614
First Using C++ You should use new instead of malloc
if you are using new you should use delete.

if it is always at position 18 have a look to the point where you allocate element 18 write the adress down
and compare it to the value that should be freed if it is not the same figure out where it is changed.

If it is the same assuming that your 48 allocations are made one after the other (no other allocation between) have a look to the point where element 17 is filled maybe inside this filling you cross the boundary

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Expert Comment

by:umarama
ID: 1322615
Can you provide more details of your current code ? Maybe there is something you could have missed.
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