From 53caf69f3ad1f0233281c694c128af9ac89e66c2 Mon Sep 17 00:00:00 2001
From: Garth Brown <gwbrown@slac.stanford.edu>
Date: Wed, 6 Nov 2019 16:27:38 -0800
Subject: [PATCH] Cast expectedLength to ssize_t where it is used as a signed
 number. Fixes buffer overrun memory corruption segfault.

---
 src/AsynDriverInterface.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/AsynDriverInterface.cc b/src/AsynDriverInterface.cc
index 861957c..1a60657 100644
--- a/src/AsynDriverInterface.cc
+++ b/src/AsynDriverInterface.cc
@@ -906,7 +906,7 @@ readHandler()
     size_t bytesToRead = peeksize;
     size_t buffersize;
 
-    if (expectedLength > 0)
+    if ((ssize_t) expectedLength > 0)
     {
         buffersize = expectedLength;
         if (peeksize > 1)