From 8d3adb745fc1c57001aeba76532258282615e7cb Mon Sep 17 00:00:00 2001
From: bbahnsen <bbahnsen@6f19259b-4bc3-4df7-8a09-765794883524>
Date: Thu, 25 May 2006 18:18:27 +0000
Subject: [PATCH] Fix a bug caused by sscanf trashing memory.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@280 6f19259b-4bc3-4df7-8a09-765794883524
---
 Tools/Source/TianoTools/GenDepex/GenDepex.c | 42 +++++++++++++--------
 1 file changed, 27 insertions(+), 15 deletions(-)

diff --git a/Tools/Source/TianoTools/GenDepex/GenDepex.c b/Tools/Source/TianoTools/GenDepex/GenDepex.c
index 2a65e086fc..608e27ecb5 100644
--- a/Tools/Source/TianoTools/GenDepex/GenDepex.c
+++ b/Tools/Source/TianoTools/GenDepex/GenDepex.c
@@ -690,21 +690,33 @@ Returns:
         Ptrx++;
       }
 
-      ArgCountParsed = sscanf (
-                        Ptrx,
-						"%x, %x, %x, { %x, %x, %x, %x, %x, %x, %x, %x }",
-                        &Guid.Data1,
-                        &Guid.Data2,
-                        &Guid.Data3,
-                        &Guid.Data4[0],
-                        &Guid.Data4[1],
-                        &Guid.Data4[2],
-                        &Guid.Data4[3],
-                        &Guid.Data4[4],
-                        &Guid.Data4[5],
-                        &Guid.Data4[6],
-                        &Guid.Data4[7]
-                        );
+      {
+        int byte_index;
+        // This is an array of UINT32s. sscanf will trash memory
+        // if you try to read into a UINT8 with a %x formatter.
+        UINT32 Guid_Data4[8];
+
+        ArgCountParsed = sscanf (
+                         Ptrx,
+            "%x, %x, %x, { %x, %x, %x, %x, %x, %x, %x, %x }",
+                         &Guid.Data1,
+                         &Guid.Data2,
+                         &Guid.Data3,
+                         &Guid_Data4[0],
+                         &Guid_Data4[1],
+                         &Guid_Data4[2],
+                         &Guid_Data4[3],
+                         &Guid_Data4[4],
+                         &Guid_Data4[5],
+                         &Guid_Data4[6],
+                         &Guid_Data4[7]
+                         );
+        
+        // Now we can copy the 32 bit ints into the GUID.
+        for (byte_index=0; byte_index<8; byte_index++) {
+          Guid.Data4[byte_index] = (UINT8) Guid_Data4[byte_index];
+        }
+      }
 
       if (ArgCountParsed != 11) {
         printf ("We have found an illegal GUID\n");
-- 
2.39.2