On Fri, May 17, 2019 at 10:41:28AM +0200, Ard Biesheuvel wrote:
> Returning an error here is not going to make much difference, given
> that the caller of efi_call_phys_prolog() does not bother to check it,
> and passes the result straight into efi_call_phys_epilog(), which
> happily attempts to
save_pgd is allocated by kmalloc_array. And it is dereferenced in the
following codes. However, memory allocation functions such as
kmalloc_array may fail. Dereferencing this save_pgd null pointer may
cause the kernel go wrong. Thus we should check this allocation and add
error handling code.
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