fix the domain name length limit checks

[musl] / src / network / res_mkquery.c

diff --git a/src/network/res_mkquery.c b/src/network/res_mkquery.c
index f7e4e9c..7c49709 100644 (file)
--- 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 */