Re: [PATCH v2] spi: ljca: validate the response length before copying the data

[Arpith Alexander]

On Tue, 13 Oct 2026 11:17:17 +0800, Weibin Liu wrote:
> Check that the response carries the full header before reading
> r_packet->len, then reject responses whose payload is not contained in
> the data received or is longer than the requested transfer.

This breaks SPI writes on a Dell XPS 13 9340: the LJCA acks a write with
only the packet header (len = bytes written, no payload), so every write
now fails with -EIO and the IVSC behind it no longer initialises.

Fix posted here:
https://lore.kernel.org/linux-spi/20261103131435.21838-1-arpith99@xxxxxxxxx/