diff --git a/builtin/fast-import.c b/builtin/fast-import.c
index 457cdb40cc..b96217483f 100644
--- a/builtin/fast-import.c
+++ b/builtin/fast-import.c
@@ -13,6 +13,7 @@
 #include "delta.h"
 #include "pack.h"
 #include "path.h"
+#include "read-cache-ll.h"
 #include "refs.h"
 #include "csum-file.h"
 #include "quote.h"
@@ -2425,6 +2426,9 @@ static void file_change_m(const char *p, struct branch *b)
 		tree_content_replace(&b->branch_tree, &oid, mode, NULL);
 		return;
 	}
+
+	if (!verify_path(path.buf, mode))
+		die("invalid path '%s'", path.buf);
 	tree_content_set(&b->branch_tree, path.buf, &oid, mode, NULL);
 }
 
@@ -2462,6 +2466,8 @@ static void file_change_cr(const char *p, struct branch *b, int rename)
 			leaf.tree);
 		return;
 	}
+	if (!verify_path(dest.buf, leaf.versions[1].mode))
+		die("invalid path '%s'", dest.buf);
 	tree_content_set(&b->branch_tree, dest.buf,
 		&leaf.versions[1].oid,
 		leaf.versions[1].mode,
diff --git a/t/t9300-fast-import.sh b/t/t9300-fast-import.sh
index 27b2025f40..b258dbf1df 100755
--- a/t/t9300-fast-import.sh
+++ b/t/t9300-fast-import.sh
@@ -521,6 +521,113 @@ 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 of ..' '
+	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
+'
+
+test_expect_success 'B: fail on invalid file path of .' '
+	cat >input <<-INPUT_END &&
+	blob
+	mark :1
+	data <<EOF
+	File contents
+	EOF
+
+	commit refs/heads/badpath
+	committer Name <email> $GIT_COMMITTER_DATE
+	data <<COMMIT
+	Good path
+	COMMIT
+	M 100644 :1 ok-path
+
+	commit refs/heads/badpath
+	committer Name <email> $GIT_COMMITTER_DATE
+	data <<COMMIT
+	Bad path
+	COMMIT
+	R ok-path ./invalid-path
+	INPUT_END
+
+	test_when_finished "git update-ref -d refs/heads/badpath" &&
+	test_must_fail git fast-import <input
+'
+
+test_expect_success WINDOWS 'B: fail on invalid file path of C:' '
+	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 C:/invalid-path
+	INPUT_END
+
+	test_when_finished "git update-ref -d refs/heads/badpath" &&
+	test_must_fail git fast-import <input
+'
+
+test_expect_success 'B: fail on invalid file path of .git' '
+	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 .git/invalid-path
+	INPUT_END
+
+	test_when_finished "git update-ref -d refs/heads/badpath" &&
+	test_must_fail git fast-import <input
+'
+
+test_expect_success 'B: fail on invalid file path of .gitmodules' '
+	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 120000 :1 .gitmodules
+	INPUT_END
+
+	test_when_finished "git update-ref -d refs/heads/badpath" &&
+	test_must_fail git fast-import <input
+'
+
 ###
 ### series C
 ###
@@ -945,7 +1052,7 @@ test_expect_success 'L: verify internal tree sorting' '
 	:100644 100644 M	ba
 	EXPECT_END
 
-	git fast-import <input &&
+	git -c core.protectNTFS=false fast-import <input &&
 	GIT_PRINT_SHA1_ELLIPSIS="yes" git diff-tree --abbrev --raw L^ L >output &&
 	cut -d" " -f1,2,5 output >actual &&
 	test_cmp expect actual
@@ -3096,7 +3203,7 @@ test_path_eol_success () {
 	test_expect_success "S: paths at EOL with $test must work" '
 		test_when_finished "git branch -D S-path-eol" &&
 
-		git fast-import --export-marks=marks.out <<-EOF >out 2>err &&
+		git -c core.protectNTFS=false fast-import --export-marks=marks.out <<-EOF >out 2>err &&
 		blob
 		mark :401
 		data <<BLOB
@@ -3205,7 +3312,7 @@ test_path_space_success () {
 	test_expect_success "S: paths before space with $test must work" '
 		test_when_finished "git branch -D S-path-space" &&
 
-		git fast-import --export-marks=marks.out <<-EOF 2>err &&
+		git -c core.protectNTFS=false fast-import --export-marks=marks.out <<-EOF 2>err &&
 		blob
 		mark :401
 		data <<BLOB
diff --git a/t/t9350-fast-export.sh b/t/t9350-fast-export.sh
index aa33791b77..40427883ec 100755
--- a/t/t9350-fast-export.sh
+++ b/t/t9350-fast-export.sh
@@ -631,7 +631,7 @@ test_expect_success 'fast-export quotes pathnames' '
 	 git rev-list HEAD >expect &&
 	 git init result &&
 	 cd result &&
-	 git fast-import <../export.out &&
+	 git -c core.protectNTFS=false fast-import <../export.out &&
 	 git rev-list HEAD >actual &&
 	 test_cmp ../expect actual
 	)