From: Elijah Newren <newren@gmail.com>
Date: Mon, 25 Nov 2024 19:00:48 +0000 (+0000)
Subject: fast-import: disallow "." and ".." path components
X-Git-Tag: v2.48.0-rc0~13^2~2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4a2790a257b314ab59f6f2e25f3d7ca120219922;p=thirdparty%2Fgit.git

fast-import: disallow "." and ".." path components

If a user specified e.g.
   M 100644 :1 ../some-file
then fast-import previously would happily create a git history where
there is a tree in the top-level directory named "..", and with a file
inside that directory named "some-file".  The top-level ".." directory
causes problems.  While git checkout will die with errors and fsck will
report hasDotdot problems, the user is going to have problems trying to
remove the problematic file.  Simply avoid creating this bad history in
the first place.

Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

diff --git a/builtin/fast-import.c b/builtin/fast-import.c
index 1e7ab67f6e..3e7ec1f119 100644
--- a/builtin/fast-import.c
+++ b/builtin/fast-import.c
@@ -1468,6 +1468,8 @@ static int tree_content_set(
 		root->tree = t = grow_tree_content(t, t->entry_count);
 	e = new_tree_entry();
 	e->name = to_atom(p, n);
+	if (is_dot_or_dotdot(e->name->str_dat))
+		die("path %s contains invalid component", p);
 	e->versions[0].mode = 0;
 	oidclr(&e->versions[0].oid, the_repository->hash_algo);
 	t->entries[t->entry_count++] = e;
diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 3b3c371740..5a5127fffa 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -522,6 +522,26 @@ test_expect_success 'B: fail on invalid committer (5)' '
 	test_must_fail git fast-import <input
 '
 
+test_expect_success 'B: fail on invalid file path' '
+	cat >input <<-INPUT_END &&
+	blob
+	mark :1
+	data <<EOF
+	File contents
+	EOF
+
+	commit refs/heads/badpath
+	committer Name <email> $GIT_COMMITTER_DATE
+	data <<COMMIT
+	Commit Message
+	COMMIT
+	M 100644 :1 ../invalid-path
+	INPUT_END
+
+	test_when_finished "git update-ref -d refs/heads/badpath" &&
+	test_must_fail git fast-import <input
+'
+
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