ShellPkg: acpiview: Set ItemPtr to NULL for unprocessed table fields

For fields outside the buffer length provided, reset any pointers,
which were supposed to be updated by a ParseAcpi() function call to
NULL. This way one can easily validate if a pointer was successfully
updated.

The ParseAcpi() function parses the given ACPI table buffer by a
number of bytes which is a minimum of the buffer length and the length
described by ACPI_PARSER array. If the buffer length is shorter than
the array describing how to process the ACPI structure, then it is
possible that the ItemPtr inside ACPI_PARSER may not get updated or
initialized. This can lead to an error if the value pointed to by
ItemPtr is later used to control the parsing logic.

A typical example would be a 'number of elements' field in an ACPI
structure header which defines how many substructures of a given type
are present in the structure body. If the 'number of elements' field
is not parsed, we will have a dangling pointer which could cause a
problem later.

Signed-off-by: Krzysztof Koch <krzysztof.koch@arm.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
index 2b2ecb9..84c5f04 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/AcpiParser.c
@@ -543,8 +543,15 @@ ParseAcpi (
 

   for (Index = 0; Index < ParserItems; Index++) {

     if ((Offset + Parser[Index].Length) > Length) {

+

+      // For fields outside the buffer length provided, reset any pointers

+      // which were supposed to be updated by this function call

+      if (Parser[Index].ItemPtr != NULL) {

+        *Parser[Index].ItemPtr = NULL;

+      }

+

       // We don't parse past the end of the max length specified

-      break;

+      continue;

     }

 

     if (GetConsistencyChecking () &&