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Re: Where's the buffer overrun?
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Re: Where's the buffer overrun?


  • Subject: Re: Where's the buffer overrun?
  • From: Andrew Farmer <email@hidden>
  • Date: Wed, 19 Mar 2008 17:00:33 -0700

On 19 Mar 08, at 16:50, Chris Suter wrote:
On 20/03/2008, at 10:38 AM, Nick Zitzmann wrote:
char **returnArray = NSZoneMalloc([self zone], length);

should be:

char **returnArray = NSZoneMalloc([self zone], length * sizeof (char *));

Actually, that's correct. Read up a bit - length is already multiplied by the pointer size.


What's bothering me a lot more is the use of an appendByte: method. NSMutableData doesn't document the existence of such a method. I'm not sure why this would cause guard_malloc to choke *later on*, but it's certainly something to look at.

A traceback would be good, too. Is the guard_malloc error in the OP's function, or in Apple's code somewhere?
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  • Follow-Ups:
    • Re: Where's the buffer overrun?
      • From: Chris Suter <email@hidden>
    • Re: Where's the buffer overrun?
      • From: Nick Zitzmann <email@hidden>
    • Re: Where's the buffer overrun?
      • From: "Hamish Allan" <email@hidden>
References: 
 >Where's the buffer overrun? (From: Nick Zitzmann <email@hidden>)
 >Re: Where's the buffer overrun? (From: Chris Suter <email@hidden>)

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