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ShellPkg: Fix memory leak when running Shell script. 

When we run following script in Shell:
"
for %a run (1 200)
  echo %a
  memmap
endfor
"
We may find memory leak in system. This patch free buffer in 'BufferToFreeList' to avoid this issue.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>


git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19521 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Qiu Shumin 2015-12-24 08:14:51 +00:00 committed by shenshushi
parent a4f138a412
commit 14810d6b64
2 changed files with 61 additions and 0 deletions
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38
ShellPkg/Application/Shell/Shell.c
View File

@ -1276,6 +1276,36 @@ AddBufferToFreeList(
return (Buffer);
}
/**
Create a new buffer list and stores the old one to OldBufferList
@param OldBufferList The temporary list head used to store the nodes in BufferToFreeList.
**/
VOID
SaveBufferList (
OUT LIST_ENTRY *OldBufferList
)
{
CopyMem (OldBufferList, &ShellInfoObject.BufferToFreeList.Link, sizeof (LIST_ENTRY));
InitializeListHead (&ShellInfoObject.BufferToFreeList.Link);
}
/**
Restore previous nodes into BufferToFreeList .
@param OldBufferList The temporary list head used to store the nodes in BufferToFreeList.
**/
VOID
RestoreBufferList (
IN OUT LIST_ENTRY *OldBufferList
)
{
FreeBufferList (&ShellInfoObject.BufferToFreeList);
CopyMem (&ShellInfoObject.BufferToFreeList.Link, OldBufferList, sizeof (LIST_ENTRY));
}
/**
Add a buffer to the Line History List
@ -2661,6 +2691,7 @@ RunScriptFileHandle (
CONST CHAR16 *CurDir;
UINTN LineCount;
CHAR16 LeString[50];
LIST_ENTRY OldBufferList;
ASSERT(!ShellCommandGetScriptExit());
@ -2763,6 +2794,8 @@ RunScriptFileHandle (
PrintBuffSize/sizeof(CHAR16) - 1
);
SaveBufferList(&OldBufferList);
//
// NULL out comments
//
@ -2897,15 +2930,19 @@ RunScriptFileHandle (
ShellCommandRegisterExit(FALSE, 0);
Status = EFI_SUCCESS;
RestoreBufferList(&OldBufferList);
break;
}
if (ShellGetExecutionBreakFlag()) {
RestoreBufferList(&OldBufferList);
break;
}
if (EFI_ERROR(Status)) {
RestoreBufferList(&OldBufferList);
break;
}
if (ShellCommandGetExit()) {
RestoreBufferList(&OldBufferList);
break;
}
}
@ -2924,6 +2961,7 @@ RunScriptFileHandle (
NewScriptFile->CurrentCommand->Reset = TRUE;
}
}
RestoreBufferList(&OldBufferList);
}

23
ShellPkg/Application/Shell/Shell.h
View File

@ -382,5 +382,28 @@ TrimSpaces(
IN CHAR16 **String
);
/**
Create a new buffer list and stores the old one to OldBufferList
@param OldBufferList The temporary list head used to store the nodes in BufferToFreeList.
**/
VOID
SaveBufferList (
OUT LIST_ENTRY *OldBufferList
);
/**
Restore previous nodes into BufferToFreeList .
@param OldBufferList The temporary list head used to store the nodes in BufferToFreeList.
**/
VOID
RestoreBufferList (
IN OUT LIST_ENTRY *OldBufferList
);
#endif //_SHELL_INTERNAL_HEADER_