explicitly fail to handle WAIT prefix

2 files changed, 8 insertions, 1 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 500d59d..1530866 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4696,6 +4696,10 @@ fn read_instr<T: Iterator<Item=u8>>(decoder: &InstDecoder, mut bytes_iter: T, in
                         0x67 => {
                             prefixes.set_address_size();
                         },
+                        0x9b => {
+                            // TODO: WAIT prefix
+                            return Err(DecodeError::IncompleteDecoder);
+                        },
                         0xf0 => {
                             prefixes.set_lock();
                         },
diff --git a/test/test.rs b/test/test.rs
index 07d715c..8c8ad25 100644
--- a/test/test.rs
+++ b/test/test.rs
@@ -4,7 +4,7 @@ extern crate yaxpeax_x86;
 use std::fmt::Write;
 
 use yaxpeax_arch::{Decoder, LengthedInstruction};
-use yaxpeax_x86::{Instruction, InstDecoder};
+use yaxpeax_x86::{DecodeError, Instruction, InstDecoder};
 
 fn test_invalid(data: &[u8]) {
     test_invalid_under(&InstDecoder::default(), data);
@@ -374,6 +374,9 @@ fn test_prefixes() {
     test_display(&[0x66, 0x41, 0x31, 0xc0], "xor r8w, ax");
     test_display(&[0x66, 0x41, 0x32, 0xc0], "xor al, r8b");
     test_display(&[0x40, 0x32, 0xc5], "xor al, bpl");
+
+    // test that WAIT doesn't blow up, at least...
+    assert_eq!(InstDecoder::default().decode([0x9b, 0xf8].iter().cloned()).err(), Some(DecodeError::IncompleteDecoder));
 }
 
 #[test]