Fix broken ECDSA DNSSEC signatures.

CHANGELOG

@@ -65,6 +65,8 @@ version 2.73
 	    configured to do stateful DHCPv6. Thanks to Win King Wan 
 	    for the patch.
 
+	    Fix broken DNSSEC validation of ECDSA signatures.
+	
 	
 version 2.72
             Add ra-advrouter mode, for RFC-3775 mobile IPv6 support.

src/dnssec.c

@@ -275,7 +275,7 @@ static int dnsmasq_ecdsa_verify(struct blockdata *key_data, unsigned int key_len
     }
   
   if (sig_len != 2*t || key_len != 2*t ||
-      (p = blockdata_retrieve(key_data, key_len, NULL)))
+      !(p = blockdata_retrieve(key_data, key_len, NULL)))
     return 0;
   
   mpz_import(x, t , 1, 1, 0, 0, p);