thodg/libgit2

diff --git a/include/git2/tag.h b/include/git2/tag.h
index 1ffeb0b..84c954c 100644
--- a/include/git2/tag.h
+++ b/include/git2/tag.h
@@ -121,7 +121,7 @@ GIT_EXTERN(const char *) git_tag_name(const git_tag *tag);
  * Get the tagger (author) of a tag
  *
  * @param tag a previously loaded tag.
- * @return reference to the tag's author
+ * @return reference to the tag's author or NULL when unspecified
  */
 GIT_EXTERN(const git_signature *) git_tag_tagger(const git_tag *tag);
 
@@ -129,7 +129,7 @@ GIT_EXTERN(const git_signature *) git_tag_tagger(const git_tag *tag);
  * Get the message of a tag
  *
  * @param tag a previously loaded tag.
- * @return message of the tag
+ * @return message of the tag or NULL when unspecified
  */
 GIT_EXTERN(const char *) git_tag_message(const git_tag *tag);
 
diff --git a/src/tag.c b/src/tag.c
index e52467f..735ba7e 100644
--- a/src/tag.c
+++ b/src/tag.c
@@ -131,7 +131,7 @@ int git_tag__parse_buffer(git_tag *tag, const char *buffer, size_t length)
 	buffer = search + 1;
 
 	tag->tagger = NULL;
-	if (*buffer != '\n') {
+	if (buffer < buffer_end && *buffer != '\n') {
 		tag->tagger = git__malloc(sizeof(git_signature));
 		GITERR_CHECK_ALLOC(tag->tagger);
 
diff --git a/tests-clar/network/fetchlocal.c b/tests-clar/network/fetchlocal.c
index e2ba675..bcf298c 100644
--- a/tests-clar/network/fetchlocal.c
+++ b/tests-clar/network/fetchlocal.c
@@ -35,7 +35,7 @@ void test_network_fetchlocal__complete(void)
 	cl_git_pass(git_remote_update_tips(origin));
 
 	cl_git_pass(git_reference_list(&refnames, repo, GIT_REF_LISTALL));
-	cl_assert_equal_i(18, (int)refnames.count);
+	cl_assert_equal_i(19, (int)refnames.count);
 	cl_assert(callcount > 0);
 
 	git_strarray_free(&refnames);
@@ -70,7 +70,7 @@ void test_network_fetchlocal__partial(void)
 	git_strarray_free(&refnames);
 
 	cl_git_pass(git_reference_list(&refnames, repo, GIT_REF_LISTALL));
-	cl_assert_equal_i(19, (int)refnames.count); /* 18 remote + 1 local */
+	cl_assert_equal_i(20, (int)refnames.count); /* 18 remote + 1 local */
 	cl_assert(callcount > 0);
 
 	git_strarray_free(&refnames);
diff --git a/tests-clar/network/remote/local.c b/tests-clar/network/remote/local.c
index db7d8af..7e847e6 100644
--- a/tests-clar/network/remote/local.c
+++ b/tests-clar/network/remote/local.c
@@ -72,7 +72,7 @@ void test_network_remote_local__retrieve_advertised_references(void)
 
 	cl_git_pass(git_remote_ls(remote, &count_ref__cb, &how_many_refs));
 
-	cl_assert_equal_i(how_many_refs, 26);
+	cl_assert_equal_i(how_many_refs, 28);
 }
 
 void test_network_remote_local__retrieve_advertised_references_from_spaced_repository(void)
@@ -86,7 +86,7 @@ void test_network_remote_local__retrieve_advertised_references_from_spaced_repos
 
 	cl_git_pass(git_remote_ls(remote, &count_ref__cb, &how_many_refs));
 
-	cl_assert_equal_i(how_many_refs, 26);
+	cl_assert_equal_i(how_many_refs, 28);
 
 	git_remote_free(remote);	/* Disconnect from the "spaced repo" before the cleanup */
 	remote = NULL;
diff --git a/tests-clar/object/tag/read.c b/tests-clar/object/tag/read.c
index 743668b..c9787a4 100644
--- a/tests-clar/object/tag/read.c
+++ b/tests-clar/object/tag/read.c
@@ -9,6 +9,7 @@ static const char *bad_tag_id = "eda9f45a2a98d4c17a09d681d88569fa4ea91755";
 static const char *badly_tagged_commit = "e90810b8df3e80c413d903f631643c716887138d";
 static const char *short_tag_id = "5da7760512a953e3c7c4e47e4392c7a4338fb729";
 static const char *short_tagged_commit = "4a5ed60bafcf4638b7c8356bd4ce1916bfede93c";
+static const char *taggerless = "4a23e2e65ad4e31c4c9db7dc746650bfad082679";
 
 static git_repository *g_repo;
 
@@ -117,3 +118,25 @@ void test_object_tag_read__parse_without_message(void)
 	git_commit_free(commit);
 	git_repository_free(short_tag_repo);
 }
+
+void test_object_tag_read__without_tagger_nor_message(void)
+{
+	git_tag *tag;
+	git_oid id;
+	git_repository *repo;
+
+	cl_git_pass(git_repository_open(&repo, cl_fixture("testrepo.git")));
+
+	cl_git_pass(git_oid_fromstr(&id, taggerless));
+
+	cl_git_pass(git_tag_lookup(&tag, repo, &id));
+
+	cl_assert_equal_s(git_tag_name(tag), "taggerless");
+	cl_assert(git_tag_target_type(tag) == GIT_OBJ_COMMIT);
+
+	cl_assert(tag->message == NULL);
+	cl_assert(tag->tagger == NULL);
+
+	git_tag_free(tag);
+	git_repository_free(repo);
+}
diff --git a/tests-clar/odb/foreach.c b/tests-clar/odb/foreach.c
index 37158d4..f643d96 100644
--- a/tests-clar/odb/foreach.c
+++ b/tests-clar/odb/foreach.c
@@ -28,8 +28,8 @@ static int foreach_cb(const git_oid *oid, void *data)
 
 /*
  * $ git --git-dir tests-clar/resources/testrepo.git count-objects --verbose
- * count: 43
- * size: 3
+ * count: 47
+ * size: 4
  * in-pack: 1640
  * packs: 3
  * size-pack: 425
@@ -42,7 +42,7 @@ void test_odb_foreach__foreach(void)
 	git_repository_odb(&_odb, _repo);
 
 	cl_git_pass(git_odb_foreach(_odb, foreach_cb, NULL));
-	cl_assert_equal_i(46 + 1640, nobj); /* count + in-pack */
+	cl_assert_equal_i(47 + 1640, nobj); /* count + in-pack */
 }
 
 void test_odb_foreach__one_pack(void)
diff --git a/tests-clar/refs/foreachglob.c b/tests-clar/refs/foreachglob.c
index 88516dd..4da1a15 100644
--- a/tests-clar/refs/foreachglob.c
+++ b/tests-clar/refs/foreachglob.c
@@ -48,8 +48,8 @@ static void assert_retrieval(const char *glob, unsigned int flags, int expected_
 
 void test_refs_foreachglob__retrieve_all_refs(void)
 {
-	/* 8 heads (including one packed head) + 1 note + 2 remotes + 6 tags */
-	assert_retrieval("*", GIT_REF_LISTALL, 21);
+	/* 12 heads (including one packed head) + 1 note + 2 remotes + 7 tags */
+	assert_retrieval("*", GIT_REF_LISTALL, 22);
 }
 
 void test_refs_foreachglob__retrieve_remote_branches(void)
diff --git a/tests-clar/resources/testrepo.git/objects/4a/23e2e65ad4e31c4c9db7dc746650bfad082679 b/tests-clar/resources/testrepo.git/objects/4a/23e2e65ad4e31c4c9db7dc746650bfad082679
new file mode 100644
index 0000000..18e3964
Binary files /dev/null and b/tests-clar/resources/testrepo.git/objects/4a/23e2e65ad4e31c4c9db7dc746650bfad082679 differ
diff --git a/tests-clar/resources/testrepo.git/refs/tags/taggerless b/tests-clar/resources/testrepo.git/refs/tags/taggerless
new file mode 100644
index 0000000..f960c7d
--- /dev/null
+++ b/tests-clar/resources/testrepo.git/refs/tags/taggerless
@@ -0,0 +1 @@
+4a23e2e65ad4e31c4c9db7dc746650bfad082679