[reactos] 02/04: [UDFS] Fix accessing an already freed pointer in UDFMarkAllocatedAsNotXXX() CORE-11182

[Victor Martinez]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=b64865fbdf7d816a773df…

commit b64865fbdf7d816a773df490f595ad0c48b99b63
Author:     Victor Martinez <vicmarcal(a)gmail.com>
AuthorDate: Sat Aug 17 16:30:21 2019 +0300
Commit:     Victor Perevertkin <victor(a)perevertkin.ru>
CommitDate: Sat Aug 17 16:49:11 2019 +0300

    [UDFS] Fix accessing an already freed pointer in UDFMarkAllocatedAsNotXXX()
    CORE-11182
---
 drivers/filesystems/udfs/udf_info/extent.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/filesystems/udfs/udf_info/extent.cpp
b/drivers/filesystems/udfs/udf_info/extent.cpp
index db4f23fa5b8..5e507d35591 100644
--- a/drivers/filesystems/udfs/udf_info/extent.cpp
+++ b/drivers/filesystems/udfs/udf_info/extent.cpp
@@ -2158,6 +2158,7 @@ UDFMarkAllocatedAsNotXXX(
         Extent[i].extLocation = 0;
         Extent[i].extLength = (Extent[i].extLength & UDF_EXTENT_LENGTH_MASK) |
flags;
         NewExtent = Extent;
+        Extent = NULL;
         AdPrint(("Alloc->Not (1) NewExtent = Extent = %x\n", NewExtent));
     } else
     if(l < BOffs) {
@@ -2211,15 +2212,17 @@ UDFMarkAllocatedAsNotXXX(
     if(Deallocate)
         UDFMarkSpaceAsXXX(Vcb, (-1), TmpExtInf.Mapping, AS_DISCARDED); // mark as free
 
+    ExtInfo->Modified = TRUE;
+    ExtInfo->Mapping = NewExtent;
+    
+    AdPrint(("Alloc->Not: ExtInfo %x, Extent %x\n", ExtInfo,
ExtInfo->Mapping));
+
     if(Extent) {
         AdPrint(("Alloc->Not kill %x\n", Extent));
         MyFreePool__(Extent);
     } else {
         AdPrint(("Alloc->Not keep %x\n", Extent));
     }
-    ExtInfo->Modified = TRUE;
-    ExtInfo->Mapping = NewExtent;
-    AdPrint(("Alloc->Not: ExtInfo %x, Extent %x\n", ExtInfo,
ExtInfo->Mapping));
 
     return STATUS_SUCCESS;
 } // end UDFMarkAllocatedAsNotXXX()