[edk2-devel] [PATCH v2 1/4] MdeModulePkg/SMM: Support to unregister SMI handler inside SMI handler

["Zhiguang Liu" <zhiguang.liu@intel.com>]

To support unregister SMI handler inside SMI handler itself,
get next node before SMI handler is executed, since LIST_ENTRY that
Link points to may be freed if unregister SMI handler in SMI handler
itself.

Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>
---
 MdeModulePkg/Core/PiSmmCore/Smi.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Core/PiSmmCore/Smi.c b/MdeModulePkg/Core/PiSmmCore/Smi.c
index 2985f989c3..3489c130fd 100644
--- a/MdeModulePkg/Core/PiSmmCore/Smi.c
+++ b/MdeModulePkg/Core/PiSmmCore/Smi.c
@@ -134,8 +134,14 @@ SmiManage (
 
   Head = &SmiEntry->SmiHandlers;
 
-  for (Link = Head->ForwardLink; Link != Head; Link = Link->ForwardLink) {
+  for (Link = Head->ForwardLink; Link != Head;) {
     SmiHandler = CR (Link, SMI_HANDLER, Link, SMI_HANDLER_SIGNATURE);
+    //
+    // To support unregister SMI handler inside SMI handler itself,
+    // get next node before handler is executed, since LIST_ENTRY that
+    // Link points to may be freed if unregister SMI handler.
+    //
+    Link = Link->ForwardLink;
 
     Status = SmiHandler->Handler (
                            (EFI_HANDLE)SmiHandler,
-- 
2.31.1.windows.1



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