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authorSzabolcs Nagy <nsz@port70.net>2014-06-05 22:52:40 +0200
committerSzabolcs Nagy <nsz@port70.net>2014-06-05 23:06:37 +0200
commit2abb70c302efe46dfd8fd9e1d64fa00f1376f428 (patch)
tree869f116a88556e51d9a4bc365bf47ad2532d3f8b /src/network/res_mkquery.c
parentb3d9e0b94ea73c68ef4169ec82c898ce59a4e30a (diff)
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fix the domain name length limit checks
A domain name is at most 255 bytes long (RFC 1035), but the string representation is two bytes smaller so the strlen maximum is 253.
Diffstat (limited to 'src/network/res_mkquery.c')
-rw-r--r--src/network/res_mkquery.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/network/res_mkquery.c b/src/network/res_mkquery.c
index f7e4e9c6..7c49709e 100644
--- a/src/network/res_mkquery.c
+++ b/src/network/res_mkquery.c
@@ -10,9 +10,9 @@ int __res_mkquery(int op, const char *dname, int class, int type,
int id, i, j;
unsigned char q[280];
struct timespec ts;
- size_t l = strnlen(dname, 256);
+ size_t l = strnlen(dname, 254);
- if (l-1>=254 || buflen<18+l || op>15u || class>255u || type>255u)
+ if (l-1>=253 || buflen<18+l || op>15u || class>255u || type>255u)
return -1;
/* Construct query template - ID will be filled later */