public inbox for devel@edk2.groups.io
 help / color / mirror / Atom feed
From: "Nate DeSimone" <nathaniel.l.desimone@intel.com>
To: devel@edk2.groups.io
Cc: Chasel Chiu <chasel.chiu@intel.com>,
	Michael A Kubacki <michael.a.kubacki@intel.com>,
	Sai Chaganty <rangasai.v.chaganty@intel.com>
Subject: [edk2-platforms] [PATCH] KabylakeSiliconPkg: Possible out-of-bounds memory writes
Date: Mon, 15 Jul 2019 13:39:33 -0700	[thread overview]
Message-ID: <20190715203933.29256-1-nathaniel.l.desimone@intel.com> (raw)

- Add check for the DSDT not existing.
- Fixed logic errors in loop boundary check.

Cc: Chasel Chiu <chasel.chiu@intel.com>
Cc: Michael A Kubacki <michael.a.kubacki@intel.com>
Cc: Sai Chaganty <rangasai.v.chaganty@intel.com>

Co-authored-by: John Mathews <john.mathews@intel.com>
Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
---
 .../Library/DxeAslUpdateLib/DxeAslUpdateLib.c               | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Silicon/Intel/KabylakeSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c b/Silicon/Intel/KabylakeSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c
index e6ab43db6d..a9611f750f 100644
--- a/Silicon/Intel/KabylakeSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c
+++ b/Silicon/Intel/KabylakeSiliconPkg/Library/DxeAslUpdateLib/DxeAslUpdateLib.c
@@ -59,6 +59,7 @@ InitializeAslUpdateLib (
   @param[in] Length            - length of data to be overwritten
 
   @retval EFI_SUCCESS          - The function completed successfully.
+  @retval EFI_NOT_FOUND        - Failed to locate AcpiTable.
 **/
 EFI_STATUS
 UpdateNameAslCode (
@@ -99,11 +100,14 @@ UpdateNameAslCode (
   /// Point to the beginning of the DSDT table
   ///
   CurrPtr = (UINT8 *) Table;
+  if (CurrPtr == NULL) {
+    return EFI_NOT_FOUND;
+  }
 
   ///
   /// Loop through the ASL looking for values that we must fix up.
   ///
-  for (DsdtPointer = CurrPtr; DsdtPointer <= (CurrPtr + ((EFI_ACPI_COMMON_HEADER *) CurrPtr)->Length); DsdtPointer++) {
+  for (DsdtPointer = CurrPtr; DsdtPointer < (CurrPtr + ((EFI_ACPI_COMMON_HEADER *) CurrPtr)->Length); DsdtPointer++) {
     ///
     /// Get a pointer to compare for signature
     ///
-- 
2.17.1.windows.2


             reply	other threads:[~2019-07-15 20:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-15 20:39 Nate DeSimone [this message]
2019-07-15 23:17 ` [edk2-platforms] [PATCH] KabylakeSiliconPkg: Possible out-of-bounds memory writes Chaganty, Rangasai V
2019-07-16  0:07 ` Chiu, Chasel

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-list from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190715203933.29256-1-nathaniel.l.desimone@intel.com \
    --to=devel@edk2.groups.io \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox