Re: __memcpy crash with [NSData -getBytes:range:]
Re: __memcpy crash with [NSData -getBytes:range:]
- Subject: Re: __memcpy crash with [NSData -getBytes:range:]
- From: "Clark Cox" <email@hidden>
- Date: Fri, 10 Oct 2008 08:09:12 -0700
On Fri, Oct 10, 2008 at 2:48 AM, Daniel Kennett <email@hidden> wrote:
> Hi list,
>
> I'm having trouble reproducing (and fixing) a rare bug that I sometimes get
> reports about.
>
> Here's the code that causes the crash. streamPosition and length are checked
> to make sure they're within the range of the NSData object:
>
> // Allocate a buffer.
> void *buffer = malloc(length);
>
> // Fill the buffer with the requested bytes.
> [_data getBytes:buffer range:NSMakeRange(streamPosition, length)];
>
> Very occasionally, this fails with this crash:
>
> Exception: EXC_BAD_ACCESS (0x0001)
> Codes: KERN_PROTECTION_FAILURE (0x0002) at 0x00000000
Since the address above is 0x00000000, I suspect that buffer is NULL.
Are you checking malloc's return value? You may be exceeding your
process' 4GB address space.
--
Clark S. Cox III
email@hidden
_______________________________________________
Cocoa-dev mailing list (email@hidden)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden