[or-cvs] r7061: Patch from Adam Langley. * I meant getaddrinfo_a, not getadd (in tor/trunk: . src/or)

[nickm at seul.org]

Author: nickm
Date: 2006-08-14 17:44:45 -0400 (Mon, 14 Aug 2006)
New Revision: 7061

Modified:
   tor/trunk/
   tor/trunk/src/or/eventdns.c
Log:
 r7386 at Kushana:  nickm | 2006-08-14 17:43:44 -0400
 Patch from Adam Langley.
 
  * I meant getaddrinfo_a, not getaddrinfo_r - fixed
  * Added more checks to the parsing code.
  * It seems you switched an alloca to a malloc, but didn't add any frees
 



Property changes on: tor/trunk
___________________________________________________________________
Name: svk:merge
   - 17f730b7-d419-0410-b50f-85ee4b70197a:/local/or/tor/trunk:8290
1f724f9b-111a-0410-b636-93f1a77c1813:/local/or/tor/trunk:8207
96637b51-b116-0410-a10e-9941ebb49b64:/tor/branches/spec:7005
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/eventdns:7054
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/mmap:7030
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/oo-connections:6950
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/trans-ap:7315
c95137ef-5f19-0410-b913-86e773d04f59:/tor/trunk:7383
   + 17f730b7-d419-0410-b50f-85ee4b70197a:/local/or/tor/trunk:8290
1f724f9b-111a-0410-b636-93f1a77c1813:/local/or/tor/trunk:8207
96637b51-b116-0410-a10e-9941ebb49b64:/tor/branches/spec:7005
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/eventdns:7386
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/mmap:7030
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/oo-connections:6950
c95137ef-5f19-0410-b913-86e773d04f59:/tor/branches/trans-ap:7315
c95137ef-5f19-0410-b913-86e773d04f59:/tor/trunk:7383

Modified: tor/trunk/src/or/eventdns.c
===================================================================
--- tor/trunk/src/or/eventdns.c	2006-08-14 21:44:39 UTC (rev 7060)
+++ tor/trunk/src/or/eventdns.c	2006-08-14 21:44:45 UTC (rev 7061)
@@ -3,7 +3,7 @@
 /* The original version of this module was written by Adam Langley; for
  * a history of modifications, check out the subversion logs.
  *
- * When editiing this module, try to keep it re-mergeable by Adam.  Don't
+ * When editing this module, try to keep it re-mergeable by Adam.  Don't
  * reformat the whitespace, add Tor dependencies, or so on.
  *
  * TODO:
@@ -39,12 +39,10 @@
  * Async DNS lookups are really a whole lot harder than they should be,
  * mostly stemming from the fact that the libc resolver has never been
  * very good at them. Before you use this library you should see if libc
- * can do the job for you with the modern async call getaddrinfo_r
- * (Google for it). Otherwise, please continue.
+ * can do the job for you with the modern async call getaddrinfo_a
+ * (see http://www.imperialviolet.org/page25.html#e498). Otherwise,
+ * please continue.
  *
- *  [I googled for getaddrinfo_r and got only two hits, one of which was this
- *  code. Did you mean something different? -NM]
- *
  * This code is based on libevent and you must call event_init before
  * any of the APIs in this file. You must also seed the OpenSSL random
  * source if you are using OpenSSL for ids (see below).
@@ -783,6 +781,7 @@
 	// packet. The name stops after a pointer like that.
 #define SKIP_NAME \
 	for(;;) { \
+                if (j >= length) return;
 		u8 label_len; \
 		GET8(label_len); \
 		if (!label_len) break; \
@@ -800,6 +799,7 @@
 		//   <label:name><u16:type><u16:class>
 		SKIP_NAME;
 		j += 4;
+                if (j >= length) return;
 	}
 
 	// now we have the answer section which looks like
@@ -1054,9 +1054,13 @@
 	labels = (u8 *) malloc(name_len + 2);
         if (!labels) return -1;
 	labels_len = dnsname_to_labels(labels, name, name_len);
-	if (labels_len < 0) return labels_len;
+	if (labels_len < 0) {
+          free(labels);
+          return labels_len;
+        }
 	memcpy(buf + j, labels, labels_len);
 	j += labels_len;
+        free(labels);
 
 	APPEND16(type);
 	APPEND16(class);