1 files changed, 95 insertions, 0 deletions
diff --git a/t/t6700-tree-depth.sh b/t/t6700-tree-depth.sh
new file mode 100755
index 0000000..9e70a7c
--- /dev/null
+++ b/t/t6700-tree-depth.sh
@@ -0,0 +1,95 @@
+#!/bin/sh
+
+test_description='handling of deep trees in various commands'
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+# We'll test against two depths here: a small one that will let us check the
+# behavior of the config setting easily, and a large one that should be
+# forbidden by default. Testing the default depth will let us know whether our
+# default is enough to prevent segfaults on systems that run the tests.
+small_depth=50
+big_depth=4100
+
+small_ok="-c core.maxtreedepth=$small_depth"
+small_no="-c core.maxtreedepth=$((small_depth-1))"
+
+# usage: mkdeep <name> <depth>
+#   Create a tag <name> containing a file whose path has depth <depth>.
+#
+# We'll use fast-import here for two reasons:
+#
+#   1. It's faster than creating $big_depth tree objects.
+#
+#   2. As we tighten tree limits, it's more likely to allow large sizes
+#      than trying to stuff a deep path into the index.
+mkdeep () {
+	{
+		echo "commit refs/tags/$1" &&
+		echo "committer foo <foo@example.com> 1234 -0000" &&
+		echo "data <<EOF" &&
+		echo "the commit message" &&
+		echo "EOF" &&
+
+		printf 'M 100644 inline ' &&
+		i=0 &&
+		while test $i -lt $2
+		do
+			printf 'a/'
+			i=$((i+1))
+		done &&
+		echo "file" &&
+
+		echo "data <<EOF" &&
+		echo "the file contents" &&
+		echo "EOF" &&
+		echo
+	} | git fast-import
+}
+
+test_expect_success 'create small tree' '
+	mkdeep small $small_depth
+'
+
+test_expect_success 'create big tree' '
+	mkdeep big $big_depth
+'
+
+test_expect_success 'limit recursion of git-archive' '
+	git $small_ok archive small >/dev/null &&
+	test_must_fail git $small_no archive small >/dev/null
+'
+
+test_expect_success 'default limit for git-archive fails gracefully' '
+	test_must_fail git archive big >/dev/null
+'
+
+test_expect_success 'limit recursion of ls-tree -r' '
+	git $small_ok ls-tree -r small &&
+	test_must_fail git $small_no ls-tree -r small
+'
+
+test_expect_success 'default limit for ls-tree fails gracefully' '
+	test_must_fail git ls-tree -r big >/dev/null
+'
+
+test_expect_success 'limit recursion of rev-list --objects' '
+	git $small_ok rev-list --objects small >/dev/null &&
+	test_must_fail git $small_no rev-list --objects small >/dev/null
+'
+
+test_expect_success 'default limit for rev-list fails gracefully' '
+	test_must_fail git rev-list --objects big >/dev/null
+'
+
+test_expect_success 'limit recursion of diff-tree -r' '
+	git $small_ok diff-tree -r $EMPTY_TREE small &&
+	test_must_fail git $small_no diff-tree -r $EMPTY_TREE small
+'
+
+test_expect_success 'default limit for diff-tree fails gracefully' '
+	test_must_fail git diff-tree -r $EMPTY_TREE big
+'
+
+test_done