commit 620f1a63 upstream.

The driver put a constant buffer of all zeros on the stack and
pointed a scatterlist entry at it.  This doesn't work with virtual
stacks.  Use ZERO_PAGE instead.
Reported-by: Eric Biggers <ebiggers3@gmail.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>