[tfaber] 63985: [FREELDR] - Improve GetPciIrqRoutingTable. Patch by Sergey Chernov (serrox at ya dot ru), small modifications by me. CORE-8440

Author: tfaber
Date: Sat Aug 30 10:59:25 2014
New Revision: 63985

URL: http://svn.reactos.org/svn/reactos?rev=63985&view=rev
Log:
[FREELDR]
- Improve GetPciIrqRoutingTable. Patch by Sergey Chernov (serrox at ya dot ru), small
modifications by me.
CORE-8440

Modified:
    trunk/reactos/boot/freeldr/freeldr/arch/i386/hwpci.c

Modified: trunk/reactos/boot/freeldr/freeldr/arch/i386/hwpci.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/boot/freeldr/freeldr/arch/…
==============================================================================
--- trunk/reactos/boot/freeldr/freeldr/arch/i386/hwpci.c	[iso-8859-1] (original)
+++ trunk/reactos/boot/freeldr/freeldr/arch/i386/hwpci.c	[iso-8859-1] Sat Aug 30 10:59:25
2014
@@ -41,6 +41,14 @@
         {
             TRACE("Found signature\n");
 
+            if (Table->TableSize < FIELD_OFFSET(PCI_IRQ_ROUTING_TABLE, Slot) ||
+                Table->TableSize % 16 != 0)
+            {
+                ERR("Invalid routing table size (%u) at %p. Continue
searching...\n", Table->TableSize, Table);
+                Table = (PPCI_IRQ_ROUTING_TABLE)((ULONG_PTR)Table + 0x10);
+                continue;
+            }
+
             Ptr = (PUCHAR)Table;
             Sum = 0;
             for (i = 0; i < Table->TableSize; i++)
@@ -50,17 +58,19 @@
 
             if ((Sum & 0xFF) != 0)
             {
-                ERR("Invalid routing table\n");
-                return NULL;
-            }
-
-            TRACE("Valid checksum\n");
-
-            return Table;
+                ERR("Invalid routing table checksum (%#lx) at %p. Continue
searching...\n", Sum & 0xFF, Table);
+            }
+            else
+            {
+                TRACE("Valid checksum\n");
+                return Table;
+            }
         }
 
         Table = (PPCI_IRQ_ROUTING_TABLE)((ULONG_PTR)Table + 0x10);
     }
+
+    ERR("No valid routing table found!\n");
 
     return NULL;
 }