qr_draw_png.mm file gives EXE_bad access error

-I have problem while creating qrcode  image from my data.
-I have application to read and write qrcode of data. When i am entering data to my application it will generate qrcode.
-while creating qrcode image some times it crash application and gives Thread 1:
-EXC_BAD_ACCESS on the following code.
Code.txt
rigelnetAsked:
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serialbandCommented:
I found this

http://stackoverflow.com/questions/3332621/exc-bad-access-while-calling-malloc-function
Which points to this
http://developer.apple.com/mac/library/qa/qa2004/qa1367.html

This kind of problem is usually the result of over-releasing an object. It can be very confusing, since the failure tends to occur well after the mistake is made. The crash can also occur while the program is deep in framework code, often with none of your own code visible in the stack.

Memory management is tricky.  I assume this is just a fragment of your code and you're calling malloc and free elsewhere and that's causing a problem when you reach this point.  You may have released a pointer when it pointed to a different location in memory, or didn't allocate the correct amount in another part of your program.  I remember spending hours on debugging malloc & free.  Even well seasoned programmers will mess inadvertently mess this up.
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