ShellPkg: Fix misuses of AllocateCopyPool

AllocateCopyPool(AllocationSize, *Buffer) will copy "AllocationSize" bytes of
memory from old "Buffer" to new allocated one. If "AllocationSize" is bigger
than size of "Buffer", heap memory overflow occurs during copy.

One solution is to allocate pool first then copy the necessary bytes to new
memory. Another is using ReallocatePool instead if old buffer will be freed
on spot.

Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Bi Dandan <dandan.bi@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/ShellPkg/Application/Shell/Shell.c b/ShellPkg/Application/Shell/Shell.c
index 5471930..656206f 100644
--- a/ShellPkg/Application/Shell/Shell.c
+++ b/ShellPkg/Application/Shell/Shell.c
@@ -1646,7 +1646,7 @@ ShellConvertVariables (
   //

   // now do the replacements...

   //

-  NewCommandLine1 = AllocateCopyPool(NewSize, OriginalCommandLine);

+  NewCommandLine1 = AllocateZeroPool (NewSize);

   NewCommandLine2 = AllocateZeroPool(NewSize);

   ItemTemp        = AllocateZeroPool(ItemSize+(2*sizeof(CHAR16)));

   if (NewCommandLine1 == NULL || NewCommandLine2 == NULL || ItemTemp == NULL) {

@@ -1655,6 +1655,8 @@ ShellConvertVariables (
     SHELL_FREE_NON_NULL(ItemTemp);

     return (NULL);

   }

+  CopyMem (NewCommandLine1, OriginalCommandLine, StrSize (OriginalCommandLine));

+

   for (MasterEnvList = EfiShellGetEnv(NULL)

     ;  MasterEnvList != NULL && *MasterEnvList != CHAR_NULL

     ;  MasterEnvList += StrLen(MasterEnvList) + 1