tree 52c9e182376b90d40df3d598cbeb8d48ba4a6838
parent d9bf23504e6521af8cbce108761eb22fe9b63136
author Johan Hovold <johan@kernel.org> 1509359727 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1512909639 +0100

spi: spi-axi: fix potential use-after-free after deregistration


[ Upstream commit 4d5e0689dc9d5640ad46cdfbe1896b74d8df1661 ]

Take an extra reference to the controller before deregistering it to
prevent use-after-free in the interrupt handler in case an interrupt
fires before the line is disabled.

Fixes: b1353d1c1d45 ("spi: Add Analog Devices AXI SPI Engine controller support")
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>