SUNRPC: Fix READ_PLUS crasher
Chuck Lever authored

Looks like there are still cases when "space_left - frag1bytes" can
legitimately exceed PAGE_SIZE. Ensure that xdr->end always remains
within the current encode buffer.
Reported-by: default avatarBruce Fields <bfields@fieldses.org>
Reported-by: default avatarZorro Lang <zlang@redhat.com>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=216151
Fixes: 6c254bf3

 ("SUNRPC: Fix the calculation of xdr->end in xdr_get_next_encode_buffer()")
Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
a23dd544