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SubjectRe: [PATCH 3/8] dm: prevent possible buffer overflow in ioctl interface
Date
On Friday 28 February 2003 12:14, Horst von Brand wrote:
> Kevin Corry <corryk@us.ibm.com> said:
> > Also, the "+1" is still necessary, even if we switch to sizeof. The
> > sprintf call that follows copies DM_DIR, followed by a slash, followed by
> > the name from the hash table into the allocated string. The "+1" is for
> > the slash in the middle. The terminating NULL character is accounted for
> > in
> > DM_NAME_LEN.
>
> Then it was broken before.
>
> sizeof("1234") == strlen("1234") + 1 == 5

Hmmm...wasn't aware of that. I guess I never expected there to be a
difference. If that's the case, then Joe Perches' earlier patch should do the
trick, albiet for obscure reasons.

And I wouldn't say it was broken the other way; it was simply allocating one
byte more than necessary.

--
Kevin Corry
corryk@us.ibm.com
http://evms.sourceforge.net/
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