On Thursday, March 6, 2003, at 01:03 pm, Roland Schwingel wrote:
Hi...
I discovered a crash in NSData...
Thanks ... I fixed it in the 1.6.0 branch of CVS
Imagine MMAP is defined. I wonder how this could ever have worked. It crashes for me (of course) self is released before the zone is taken from it.
It would work because, GSObjCZone() would get the zone from an offset against the address of self, and generally while deallocating self will have returned the memory to the memory allocation system, it will not have been overwritten and will therefore still contain the correct pointer to the zone.
In general, method calls on a deallocated object will crash because the deallocation process overwrites the 'isa' pointer in the object, which is used to locate the method implementation to be used. Direct accesses into the rest of the memory of a (very) recently deallocated object will often/usually work.
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