File rdesktop-scard.patch of Package rdesktop

Index: scard.c
===================================================================
--- scard.c	(revision 1609)
+++ scard.c	(working copy)
@@ -1874,7 +1874,7 @@
 		dwAttrLen = MAX_BUFFER_SIZE;
 
 
-	if (dwAttrLen > SCARD_AUTOALLOCATE)
+	if ((dwAttrLen > SCARD_AUTOALLOCATE) || (dwAttrLen == 0))
 		pbAttr = NULL;
 	else if ((dwAttrLen < 0) || (dwAttrLen > SCARD_MAX_MEM))
 	{