Security fix for CVE-2009-3994: buffer overflow in DICOM reader

--- src-IL/src/il_dicom.c.orig	Tue Mar 29 19:39:24 2011
+++ src-IL/src/il_dicom.c	Tue Mar 29 19:40:05 2011
@@ -427,9 +427,11 @@ ILboolean GetUID(ILubyte *UID)
 		return IL_FALSE;
 
 	ValLen = GetLittleUShort();
+	if (ValLen > 64)
+		return IL_FALSE;
 	if (iread(UID, ValLen, 1) != 1)
 		return IL_FALSE;
-	UID[64] = 0;  // Just to make sure that our string is terminated.
+	UID[ValLen] = 0;  // Just to make sure that our string is terminated.
 
 	return IL_TRUE;
 }