SECURITY: DKIM DNS buffer overflow protection

[exim.git] / src / src / dkim.c

diff --git a/src/src/dkim.c b/src/src/dkim.c
index 87e91dea25ab1c62fd45cf6a65c1bf125d35af6d..05b5fec56e62073f4f5d1d1640ee42d7ca782bad 100644 (file)
--- a/src/src/dkim.c
+++ b/src/src/dkim.c
@@ -42,6 +42,9 @@ int dkim_exim_query_dns_txt(char *name, char *answer) {
                "%.*s", (int)len, (char *)((rr->data)+rr_offset));
       rr_offset+=len;
       answer_offset+=len;
+      if (answer_offset >= PDKIM_DNS_TXT_MAX_RECLEN) {
+        return PDKIM_FAIL;
+      }
     }
   }
   else return PDKIM_FAIL;