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If we get back too much data to fit in result, return NULL. This avoids

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a buffer overflow, but might negatively impact those hosts who have
enough aliases to fill MAXHOSTNAMELEN * 2 characters in them.

Good candidate for merging back into -stable.  Lightly tested by me, but
it came from OpenBSD a while ago.

Obtained from: OpenBSD
This commit is contained in:
Warner Losh 1998-06-09 05:06:27 +00:00
parent d944ccabfc
commit 67d3ec9a0f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=36797
1 changed files with 5 additions and 1 deletions
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6
usr.sbin/ypserv/yp_dnslookup.c
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@ -32,7 +32,7 @@
#ifndef lint
static const char rcsid[] =
"$Id$";
"$Id: yp_dnslookup.c,v 1.13 1997/10/29 07:25:02 charnier Exp $";
#endif /* not lint */
/*
@ -79,6 +79,10 @@ static char *parse(hp)
len = 16 + strlen(hp->h_name);
for (i = 0; hp->h_aliases[i]; i++)
len += strlen(hp->h_aliases[i]) + 1;
len++;
if (len > sizeof(result))
return(NULL);
bzero(result, sizeof(result));