X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fparse.c;fp=src%2Fparse.c;h=790c8ce51b3da32f1f3282d27123d4391022c481;hb=7ba7a232de0516d2cce934bdc91627b33b46ef47;hp=07d0614afcbf6d002849e99c1940bbda64a3cd06;hpb=020d86e2eccc2dbdfa9dcca08ddb327cc7ca3ae2;p=adns.git

diff --git a/src/parse.c b/src/parse.c
index 07d0614..790c8ce 100644
--- a/src/parse.c
+++ b/src/parse.c
@@ -71,6 +71,7 @@ adns_status adns__findlabel_next(findlabel_state *fls,
 				 int *lablen_r, int *labstart_r) {
   int lablen, jumpto;
   const char *dgram;
+  int had_pointer= 0;
 
   dgram= fls->dgram;
   for (;;) {
@@ -81,6 +82,7 @@ adns_status adns__findlabel_next(findlabel_state *fls,
     if ((lablen & 0x0c0) != 0x0c0) return adns_s_unknownformat;
     if (fls->cbyte >= fls->dglen) goto x_truncated;
     if (fls->cbyte >= fls->max) goto x_badresponse;
+    if (had_pointer++ >= 2) goto x_loop;
     GET_B(fls->cbyte,jumpto);
     jumpto |= (lablen&0x3f)<<8;
     if (fls->dmend_r) *(fls->dmend_r)= fls->cbyte;
@@ -109,6 +111,11 @@ adns_status adns__findlabel_next(findlabel_state *fls,
   adns__diag(fls->ads,fls->serv,fls->qu,
 	     "label in domain runs beyond end of domain");
   return adns_s_invalidresponse;
+
+ x_loop: 
+  adns__diag(fls->ads,fls->serv,fls->qu,
+	     "compressed label pointer chain");
+  return adns_s_invalidresponse;
 }
 
 adns_status adns__parse_domain(adns_state ads, int serv, adns_query qu,