If peek fails, force EOF with a read

DataSource_Stream::peek resets EOF bit after a failed peek

Fixes #657 cert_info infinite loop

1 files changed, 3 insertions, 0 deletions

diff --git a/src/lib/asn1/asn1_obj.cpp b/src/lib/asn1/asn1_obj.cpp
index 20555e3dd..e258cd809 100644
--- a/src/lib/asn1/asn1_obj.cpp
+++ b/src/lib/asn1/asn1_obj.cpp
@@ -56,7 +56,10 @@ bool maybe_BER(DataSource& source)
    {
    byte first_byte;
    if(!source.peek_byte(first_byte))
+      {
+      source.read_byte(first_byte); // force EOF
       throw Stream_IO_Error("ASN1::maybe_BER: Source was empty");
+      }
 
    if(first_byte == (SEQUENCE | CONSTRUCTED))
       return true;