openpgp: In case of parse errors, rewind the reader.

  - Rewind the dup reader, so that the caller has a chance to buffer
    the whole body of the unknown packet.  This is important for
    roundtripping signatures that we don't understand.

1 files changed, 4 insertions, 1 deletions

diff --git a/openpgp/src/parse/parse.rs b/openpgp/src/parse/parse.rs
index 3722f79b..90f7264f 100644
--- a/openpgp/src/parse/parse.rs
+++ b/openpgp/src/parse/parse.rs
@@ -337,7 +337,10 @@ impl<'a> PacketHeaderParser<'a> {
         self.error(Error::MalformedPacket(reason.into()).into())
     }
 
-    fn error(self, error: failure::Error) -> Result<PacketParser<'a>> {
+    fn error(mut self, error: failure::Error) -> Result<PacketParser<'a>> {
+        // Rewind the dup reader, so that the caller has a chance to
+        // buffer the whole body of the unknown packet.
+        self.reader.rewind();
         Unknown::parse(self, error)
     }