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| author | wpaul <wpaul@FreeBSD.org> | 1995-03-23 22:23:15 +0000 |
|---|---|---|
| committer | wpaul <wpaul@FreeBSD.org> | 1995-03-23 22:23:15 +0000 |
| commit | 7cd88703a8ca8c45c2a9e08e6eedbabc380b0734 (patch) | |
| tree | 39d7b9d41b9c4d5dcced28d88862222c09c8e8bd /lib/libc/yp | |
| parent | 77a782d587a39905e0b59d730a755c5eab1c5951 (diff) | |
| download | FreeBSD-src-7cd88703a8ca8c45c2a9e08e6eedbabc380b0734.zip FreeBSD-src-7cd88703a8ca8c45c2a9e08e6eedbabc380b0734.tar.gz | |
Don't let yp_match() or yp_next() operate on null or empty keys: asking
ypserv to do a yp_match() with an a null or empty key causes much havok.
(Note that this could be construed as a denial of service attack if used
maliciously.)
Diffstat (limited to 'lib/libc/yp')
| -rw-r--r-- | lib/libc/yp/yplib.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/libc/yp/yplib.c b/lib/libc/yp/yplib.c index 1187a66..f9d881d 100644 --- a/lib/libc/yp/yplib.c +++ b/lib/libc/yp/yplib.c @@ -28,7 +28,7 @@ */ #ifndef LINT -static char *rcsid = "$Id: yplib.c,v 1.1 1994/08/07 23:04:55 wollman Exp $"; +static char *rcsid = "$Id: yplib.c,v 1.2 1995/03/21 00:48:55 wpaul Exp $"; #endif #include <sys/param.h> @@ -380,6 +380,11 @@ int *outvallen; *outval = NULL; *outvallen = 0; + /* Sanity check: no null keys allowed! */ + + if (inkey == NULL || *inkey == '\0') + return YPERR_KEY; + again: if( _yp_dobind(indomain, &ysd) != 0) return YPERR_DOMAIN; @@ -510,6 +515,11 @@ int *outvallen; *outkey = *outval = NULL; *outkeylen = *outvallen = 0; + /* Sanity check: no null keys allowed! */ + + if (inkey == NULL || *inkey == '\0') + return YPERR_KEY; + again: if( _yp_dobind(indomain, &ysd) != 0) return YPERR_DOMAIN; |
