[PATCH] kernelbase: Check for NULL buffer in PeekNamedPipe().

[Zhiyi Zhang]

On 9/6/19 12:09 AM, Andrey Gusev wrote:
> Signed-off-by: Andrey Gusev <andrey.goosev at gmail.com>
> ---
>  dlls/kernelbase/sync.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/dlls/kernelbase/sync.c b/dlls/kernelbase/sync.c
> index 31df6c7be8..bc35ff7c2a 100644
> --- a/dlls/kernelbase/sync.c
> +++ b/dlls/kernelbase/sync.c
> @@ -1224,6 +1224,8 @@ BOOL WINAPI DECLSPEC_HOTPATCH PeekNamedPipe( HANDLE pipe, LPVOID out_buffer, DWO
>      IO_STATUS_BLOCK io;
>      NTSTATUS status;
>  
> +    if (!buffer) return FALSE;
Why is this change needed? 'buffer' is assigned to an address of a local variable, so it should never be NULL.

Or if you mean 'out_buffer', it could be NULL according to MSDN and you need a test to verify the change.

> +
>      if (size && !(buffer = HeapAlloc( GetProcessHeap(), 0,
>                                        FIELD_OFFSET( FILE_PIPE_PEEK_BUFFER, Data[size] ))))
>      {