commit b3d9e0b94ea73c68ef4169ec82c898ce59a4e30a
Author: Szabolcs Nagy <nsz@port70.net>
Date:   Thu Jun 5 22:32:42 2014 +0200

    fix multiple validation issues in dns response label parsing
    
    Due to an error introduced in commit fcc522c92335783293ac19df318415cd97fbf66b,
    checking of the remaining output buffer space was not performed correctly,
    allowing malformed input to write past the end of the buffer.
    
    In addition, the loop detection logic failed to account for the possibility
    of infinite loops with no output, which would hang the function.
    
    The output size is now limited more strictly so only names with valid length
    are accepted.

diff --git a/src/network/dn_expand.c b/src/network/dn_expand.c
index 96adf37..849df19 100644
--- a/src/network/dn_expand.c
+++ b/src/network/dn_expand.c
@@ -4,10 +4,11 @@
 int __dn_expand(const unsigned char *base, const unsigned char *end, const unsigned char *src, char *dest, int space)
 {
 	const unsigned char *p = src;
-	int len = -1, j;
-	if (space > 256) space = 256;
+	char *dend = dest + (space > 254 ? 254 : space);
+	int len = -1, i, j;
 	if (p==end || !*p) return -1;
-	for (;;) {
+	/* detect reference loop using an iteration counter */
+	for (i=0; i < end-base; i+=2) {
 		if (*p & 0xc0) {
 			if (p+1==end) return -1;
 			j = ((p[0] & 0x3f) << 8) | p[1];
@@ -16,7 +17,7 @@ int __dn_expand(const unsigned char *base, const unsigned char *end, const unsig
 			p = base+j;
 		} else if (*p) {
 			j = *p+1;
-			if (j>=end-p || j>space) return -1;
+			if (j>=end-p || j>dend-dest) return -1;
 			while (--j) *dest++ = *++p;
 			*dest++ = *++p ? '.' : 0;
 		} else {
@@ -24,6 +25,7 @@ int __dn_expand(const unsigned char *base, const unsigned char *end, const unsig
 			return len;
 		}
 	}
+	return -1;
 }
 
 weak_alias(__dn_expand, dn_expand);