Return error on invalid length

2018-12-24 00:23:52 +01:00
parent c6b8e90a50
commit 8a64254c95
1 changed files with 3 additions and 0 deletions
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -374,6 +374,9 @@ fn from_der_(i: &[u8], start_offset: usize)
        let soff = start_offset + index;
        let (tag, constructed, class) = decode_tag(i, &mut index);
        let len = decode_length(i, &mut index)?;
+        if i.len() < index + len {
+            return Err(ASN1DecodeErr::LengthTooLarge(index + len));
+        }
        let body = &i[index .. (index + len)];

        if class != ASN1Class::Universal {