Date: Sat, 14 Jun 1997 06:10:02 -0700 (PDT) From: Tim Vanderhoek <tim@X2296> To: freebsd-bugs Subject: Re: bin/3451: vasprintf() doesn't work. Message-ID: <199706141310.GAA22358@hub.freebsd.org>
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The following reply was made to PR bin/3451; it has been noted by GNATS.
From: Tim Vanderhoek <tim@X2296>
To: Bruce Evans <bde@zeta.org.au>
Cc: ac199@hwcn.org, freebsd-bugs@hub.freebsd.org,
freebsd-gnats-submit@freebsd.org
Subject: Re: bin/3451: vasprintf() doesn't work.
Date: Sat, 14 Jun 1997 09:07:46 -0400 (EDT)
On Sat, 14 Jun 1997, Bruce Evans wrote:
> > *str = realloc(h.base, (size_t)(h.size - h.left + 1));
> > if (*str == NULL) /* failed to realloc it to actual size */
> > ! return (-1);
> > ! (*str)[h.size - h.left] = '\0';
> > return (ret);
> > }
>
> One more problem: realloc() can fail, resulting in a leaking the memory
> pointed to by h.base.
Which, of course, points us to yet another error in the original
vasprintf.c... :) The test to see if str is NULL is
*str == NULL....
Final patch frees h.base (as is done everywhere else) and fixes
that... :)
*** old.vasprintf.c Tue Apr 29 21:32:00 1997
--- vasprintf.c Sat Jun 14 08:56:41 1997
***************
*** 111,119 ****
if (h.base == NULL) /* failed to realloc in writehook */
return (-1);
- h.base[h.size - h.left] = '\0';
*str = realloc(h.base, (size_t)(h.size - h.left + 1));
! if (*str == NULL) /* failed to realloc it to actual size */
! *str = h.base; /* return oversize buffer */
return (ret);
}
--- 111,121 ----
if (h.base == NULL) /* failed to realloc in writehook */
return (-1);
*str = realloc(h.base, (size_t)(h.size - h.left + 1));
! if (str == NULL) { /* failed to realloc it to actual size */
! free(h.base);
! return (-1);
! }
! (*str)[h.size - h.left] = '\0';
return (ret);
}
--
tIM...HOEk
optimization: The theory that making your code incomprehensible by using
only one-letter variable names will make it run faster.
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