diff --git a/builtin/check-ignore.c b/builtin/check-ignore.c
index 709535ce09fd3876e48e6e7b81bc2f6654e04c1e..0240f99b57a2f81320b84951bf6dc89ab60d6282 100644
--- a/builtin/check-ignore.c
+++ b/builtin/check-ignore.c
@@ -89,7 +89,7 @@ static int check_ignore(const char *prefix, const char **pathspec)
 					? strlen(prefix) : 0, path);
 		full_path = check_path_for_gitlink(full_path);
 		die_if_path_beyond_symlink(full_path, prefix);
-		if (!seen[i] && path[0]) {
+		if (!seen[i]) {
 			exclude = last_exclude_matching_path(&check, full_path,
 							     -1, &dtype);
 			if (exclude) {
diff --git a/name-hash.c b/name-hash.c
index d8d25c23e99dddd9bd0bf83d73f2ae136d7307b5..942c45962252eba4c6f88b4f4f7593c9247749ae 100644
--- a/name-hash.c
+++ b/name-hash.c
@@ -24,11 +24,11 @@ static unsigned int hash_name(const char *name, int namelen)
 {
 	unsigned int hash = 0x123;
 
-	do {
+	while (namelen--) {
 		unsigned char c = *name++;
 		c = icase_hash(c);
 		hash = hash*101 + c;
-	} while (--namelen);
+	}
 	return hash;
 }
 
diff --git a/t/t0008-ignores.sh b/t/t0008-ignores.sh
index ebe7c701fece257db1defdbbcd2b43105956875b..9c1bde1fd6e6424f7af732556656a9daf9be350b 100755
--- a/t/t0008-ignores.sh
+++ b/t/t0008-ignores.sh
@@ -138,6 +138,7 @@ test_expect_success 'setup' '
 	cat <<-\EOF >.gitignore &&
 		one
 		ignored-*
+		top-level-dir/
 	EOF
 	for dir in . a
 	do
@@ -177,6 +178,10 @@ test_expect_success 'setup' '
 #
 # test invalid inputs
 
+test_expect_success_multi '. corner-case' '' '
+	test_check_ignore . 1
+'
+
 test_expect_success_multi 'empty command line' '' '
 	test_check_ignore "" 128 &&
 	stderr_contains "fatal: no path specified"