From: ian <ian>
Date: Tue, 15 Jan 2008 22:32:49 +0000 (+0000)
Subject: only allow ordinary parsing of pic cmds if length and terminator match
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ijackson/git?a=commitdiff_plain;h=ec3fab58f5b1f9ab95e971948dca5304d112039a;p=trains.git

only allow ordinary parsing of pic cmds if length and terminator match
---

diff --git a/hostside/skelproto-pic.c b/hostside/skelproto-pic.c
index 0808ba6..31895b2 100644
--- a/hostside/skelproto-pic.c
+++ b/hostside/skelproto-pic.c
@@ -58,7 +58,7 @@ void picinsn_decode(const PicInsn *pi, const PicInsnInfo *table,
     if (pii->argbits <= 6) {
       if (pi->l != 1) pii= 0;
     } else {
-      if (pi->l == 2) { val <<= 7; val |= pi->d[1]; }
+      if (pi->l == 2 && !(pi->d[1] & 0x80u)) { val <<= 7; val |= pi->d[1]; }
       else pii= 0;
     }
   }