BIND 10 trac2389, updated. 27dcc01ebedf492bdf7e281efe76223c7987c757 [2389] added more notes on length validation for from-str in::A ctor

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- Log -----------------------------------------------------------------
commit 27dcc01ebedf492bdf7e281efe76223c7987c757
Author: JINMEI Tatuya <jinmei at isc.org>
Date:   Tue Feb 26 13:19:02 2013 -0800

    [2389] added more notes on length validation for from-str in::A ctor

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Summary of changes:
 src/lib/dns/rdata/in_1/a_1.cc |    4 ++++
 1 file changed, 4 insertions(+)

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diff --git a/src/lib/dns/rdata/in_1/a_1.cc b/src/lib/dns/rdata/in_1/a_1.cc
index c9ae65d..b187346 100644
--- a/src/lib/dns/rdata/in_1/a_1.cc
+++ b/src/lib/dns/rdata/in_1/a_1.cc
@@ -45,6 +45,10 @@ convertToIPv4Addr(const char* src, size_t src_len, uint32_t* dst) {
     // This check specifically rejects invalid input that begins with valid
     // address text followed by a nul character (and possibly followed by
     // further garbage).  It cannot be detected by inet_pton().
+    //
+    // Note that this is private subroutine of the in::A constructors, which
+    // pass std::string.size() or StringRegion::len as src_len, so it should
+    // be equal to strlen() unless there's an intermediate nul character.
     if (src_len != strlen(src)) {
         isc_throw(InvalidRdataText,
                   "Bad IN/A RDATA text: unexpected nul in string: '"