[PATCH v2 3/3] mailinfo: disallow NUL character in mail's header

["Đoàn Trần Công Danh" <congdanhqx@gmail.com>]

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
---
 mailinfo.c            | 5 +++++
 t/t4254-am-corrupt.sh | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/mailinfo.c b/mailinfo.c
index 0e9911df6d..c31991e621 100644
--- a/mailinfo.c
+++ b/mailinfo.c
@@ -1138,6 +1138,11 @@ static void handle_info(struct mailinfo *mi)
 		else
 			continue;
 
+		if (memchr(hdr->buf, '\0', hdr->len)) {
+			error("a NUL byte in %s is not allowed.", header[i]);
+			mi->input_error = -1;
+		}
+
 		if (!strcmp(header[i], "Subject")) {
 			if (!mi->keep_subject) {
 				cleanup_subject(mi, hdr);
diff --git a/t/t4254-am-corrupt.sh b/t/t4254-am-corrupt.sh
index 98cda32d0a..d9d1ac6c7d 100755
--- a/t/t4254-am-corrupt.sh
+++ b/t/t4254-am-corrupt.sh
@@ -69,9 +69,11 @@ test_expect_success "NUL in commit message's body" '
 	grep "a NUL byte in commit log message not allowed" err
 '
 
-test_expect_failure "NUL in commit message's header" '
+test_expect_success "NUL in commit message's header" '
 	test_when_finished "git am --abort" &&
 	write_nul_patch subject >subject.patch &&
+	test_must_fail git mailinfo msg patch <subject.patch 2>err &&
+	grep "a NUL byte in Subject is not allowed" err &&
 	test_must_fail git am subject.patch 2>err &&
 	grep "a NUL byte in Subject is not allowed" err
 '
-- 
2.26.1.301.g55bc3eb7cb