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>

diff --git a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
index 7626bac38d00b0f2799710dff8fa7186c8ab3545..bda900a1613bf9cc2d7eca78c546f271c7815b62 100644 (file)
--- a/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
+++ b/MdeModulePkg/Bus/Ata/AtaAtapiPassThru/AhciMode.c
@@ -885,6 +885,13 @@ AhciPrintStatusBlock (
   IN UINT32                DebugLevel\r
   )\r
 {\r
+  //\r
+  // Skip NULL pointer\r
+  //\r
+  if (AtaStatusBlock == NULL) {\r
+    return;\r
+  }\r
+\r
   //\r
   // Only print status and error since we have all of the rest printed as\r
   // a part of command block print.\r