[edk2-devel] [PATCH] Silicon/Synopsys/DesignWare: DwEmacSnpDxe: Fix bug in EmacGetDmaStatus

[wangyzhaoz]

From: Yang Wang <wangyzh...@163.com>

Check EmacGetDmaStatus input parameters
IrqStat may be a null pointer.

Cc: Michael D Kinney <michael.d.kin...@intel.com>
Cc: Loh Tien Hock <tien.hock....@intel.com>
Cc: Ooi Tzy Way <tzy.way....@intel.com>
Cc: Ran Wang <wang...@bosc.ac.cn>

Signed-off-by: Yang Wang <wangyzh...@163.com>
---
 .../Drivers/DwEmacSnpDxe/DwEmacSnpDxe.c          |  7 +++++--
 .../Drivers/DwEmacSnpDxe/EmacDxeUtil.c           | 16 ++++++++++++----
 .../Drivers/DwEmacSnpDxe/EmacDxeUtil.h           |  2 +-
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/DwEmacSnpDxe.c 
b/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/DwEmacSnpDxe.c
index 4cb3371d79..6805511a1d 100755
--- a/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/DwEmacSnpDxe.c
+++ b/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/DwEmacSnpDxe.c
@@ -847,9 +847,12 @@ SnpGetStatus (
   }
 
   // Check DMA Irq status
-  EmacGetDmaStatus (IrqStat, Snp->MacBase);
+  Status = EmacGetDmaStatus (IrqStat, Snp->MacBase);
+  if (EFI_ERROR(Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: error  Status: %r\n", __func__, Status));
+  }
 
-  return EFI_SUCCESS;
+  return Status;
 }
 
 
diff --git a/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.c 
b/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.c
index 3b982ce984..45b5a05f51 100755
--- a/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.c
+++ b/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.c
@@ -489,16 +489,22 @@ EmacDmaStart (
 }
 
 
-VOID
+EFI_STATUS
 EFIAPI
 EmacGetDmaStatus (
   OUT  UINT32   *IrqStat  OPTIONAL,
   IN   UINTN    MacBaseAddress
   )
 {
-  UINT32  DmaStatus;
-  UINT32  ErrorBit;
-  UINT32  Mask = 0;
+  UINT32        DmaStatus;
+  UINT32        ErrorBit;
+  UINT32        Mask = 0;
+  EFI_STATUS    Status = EFI_SUCCESS;
+
+  if (IrqStat == NULL) {
+    Status = EFI_INVALID_PARAMETER;
+    goto EXIT;
+  }
 
   DmaStatus = MmioRead32 (MacBaseAddress +
                            DW_EMAC_DMAGRP_STATUS_OFST);
@@ -602,6 +608,8 @@ EmacGetDmaStatus (
   MmioOr32 (MacBaseAddress +
             DW_EMAC_DMAGRP_STATUS_OFST,
             Mask);
+EXIT:
+  return Status;
 }
 
 
diff --git a/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.h 
b/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.h
index c4c3653dc7..60f30ecd16 100755
--- a/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.h
+++ b/Silicon/Synopsys/DesignWare/Drivers/DwEmacSnpDxe/EmacDxeUtil.h
@@ -339,7 +339,7 @@ EmacDmaStart (
   );
 
 
-VOID
+EFI_STATUS
 EFIAPI
 EmacGetDmaStatus (
   OUT UINT32                  *IrqStat  OPTIONAL,
-- 
2.25.1



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