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spi: spi-topcliff-pch: Fix potential double free in pch_spi_process_m…
…essages() [ Upstream commit 026a1dc ] pch_spi_set_tx() frees data->pkt_tx_buff on failure of kzalloc() for data->pkt_rx_buff, but its caller, pch_spi_process_messages(), will free data->pkt_tx_buff again. Set data->pkt_tx_buff to NULL after kfree() to avoid double free. Signed-off-by: Jay Fang <f.fangjian@huawei.com> Link: https://lore.kernel.org/r/1620284888-65215-1-git-send-email-f.fangjian@huawei.com Signed-off-by: Mark Brown <broonie@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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