mailinfo: disallow NUL character in mail's header

Signed-off-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/mailinfo.c b/mailinfo.c
index 0e9911d..5681d91 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);