Fix CVE-2009-3994 (buffer overflow in GetUID() allows remote DOS or
arbitrary code execution via crafted DICOM file).

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3994

Copied from Fedora
https://pkgs.fedoraproject.org/cgit/rpms/DevIL.git/tree/DevIL-1.7.8-CVE-2009-3994.patch?id=9c656a75393d6c455aef9f4968fbbee9c53f4fdb

diff -up devil-1.7.8/src-IL/src/il_dicom.c~ devil-1.7.8/src-IL/src/il_dicom.c
--- devil-1.7.8/src-IL/src/il_dicom.c~	2009-03-08 08:10:09.000000000 +0100
+++ devil-1.7.8/src-IL/src/il_dicom.c	2009-12-03 12:07:45.000000000 +0100
@@ -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;
 }