From 4c7ce0d285bc7fd593718fd5dec02e136cbfad8e Mon Sep 17 00:00:00 2001
From: Liming Gao <gaoliming@byosoft.com.cn>
Date: Tue, 16 Nov 2021 10:52:07 +0800
Subject: MdeModulePkg AtaAtapiPassThru: Skip the potential NULL pointer access

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3732
Recent change c9742578 exposes this potential issue.

Signed-off-by: Liming Gao <gaoliming@byosoft.com.cn>
Acked-by: Rebecca Cran <rebecca@nuviainc.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
---
 MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index 7626bac38d..bda900a161 100644
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -885,6 +885,13 @@ AhciPrintStatusBlock (
   IN UINT32                DebugLevel
   )
 {
+  //
+  // Skip NULL pointer
+  //
+  if (AtaStatusBlock == NULL) {
+    return;
+  }
+
   //
   // Only print status and error since we have all of the rest printed as
   // a part of command block print.
-- 
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