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ShellPkg/App: Fix memory leak and save resources. 

1) RunSplitCommand() allocates the initial SplitStdOut via
   CreateFileInterfaceMem(). Free SplitStdIn after the swap to fix
   the memory leak.

2) In RunSplitCommand(), SplitStdOut is checked for equality with
   StdIn. This cannot happen due to the if-check within the swap.
   Hence remove it.

3) UefiMain() doesn't free SplitList. Delete all list entries and
   reinitialize the list when in DEBUG. This does not include the
   CreateFileInterfaceMem()-allocated SplitStd mentioned in 1), so
   keep the ASSERT() until resolved.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
Reviewed-by: Qiu Shumin <shumin.qiu@intel.com>
This commit is contained in:
Marvin H?user 2016-05-20 03:04:02 +08:00 committed by Qiu Shumin
parent dc99315b87
commit bd3fc8133b
1 changed files with 14 additions and 2 deletions
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16
ShellPkg/Application/Shell/Shell.c
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@ -342,6 +342,7 @@ UefiMain (
UINTN Size;
EFI_HANDLE ConInHandle;
EFI_SIMPLE_TEXT_INPUT_PROTOCOL *OldConIn;
SPLIT_LIST *Split;
if (PcdGet8(PcdShellSupportLevel) > 3) {
return (EFI_UNSUPPORTED);
@ -675,7 +676,17 @@ FreeResources:
}
if (!IsListEmpty(&ShellInfoObject.SplitList.Link)){
ASSERT(FALSE); ///@todo finish this de-allocation.
ASSERT(FALSE); ///@todo finish this de-allocation (free SplitStdIn/Out when needed).
for ( Split = (SPLIT_LIST*)GetFirstNode (&ShellInfoObject.SplitList.Link)
; !IsNull (&ShellInfoObject.SplitList.Link, &Split->Link)
; Split = (SPLIT_LIST *)GetNextNode (&ShellInfoObject.SplitList.Link, &Split->Link)
) {
RemoveEntryList (&Split->Link);
FreePool (Split);
}
DEBUG_CODE (InitializeListHead (&ShellInfoObject.SplitList.Link););
}
if (ShellInfoObject.ShellInitSettings.FileName != NULL) {
@ -1743,11 +1754,12 @@ RunSplitCommand(
//
// Note that the original StdIn is now the StdOut...
//
if (Split->SplitStdOut != NULL && Split->SplitStdOut != StdIn) {
if (Split->SplitStdOut != NULL) {
ShellInfoObject.NewEfiShellProtocol->CloseFile(ConvertShellHandleToEfiFileProtocol(Split->SplitStdOut));
}
if (Split->SplitStdIn != NULL) {
ShellInfoObject.NewEfiShellProtocol->CloseFile(ConvertShellHandleToEfiFileProtocol(Split->SplitStdIn));
FreePool (Split->SplitStdIn);
}
FreePool(Split);