tree b8c512981fb37efb39ca9643c8d9c16b4984cbeb
parent 2ff0573e7aff5129d73ec5c3159cd84d862cb1cc
author Fei Shao <fshao@chromium.org> 1711004937 +0800
committer Mark Brown <broonie@kernel.org> 1711020501 +0000
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spi: spi-mt65xx: Fix NULL pointer access in interrupt handler

The TX buffer in spi_transfer can be a NULL pointer, so the interrupt
handler may end up writing to the invalid memory and cause crashes.

Add a check to trans->tx_buf before using it.

Fixes: 1ce24864bff4 ("spi: mediatek: Only do dma for 4-byte aligned buffers")
Signed-off-by: Fei Shao <fshao@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://msgid.link/r/20240321070942.1587146-2-fshao@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>