staging: greybus: spilib: fix use-after-free after deregistration
authorJohan Hovold <johan@kernel.org>
Sun, 29 Oct 2017 12:01:33 +0000 (13:01 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 21 Nov 2017 08:49:24 +0000 (09:49 +0100)
commit5abe8d48471c212c45cbb0d522b70d76325ceac0
treeea3afbfec08ace8ef70f0eb074670b16bbec676d
parent75559e0f485432202fdf3c960229d75b77069076
staging: greybus: spilib: fix use-after-free after deregistration

commit 770b03c2ca4aa44d226cf248f86aa23e546147d0 upstream.

Remove erroneous spi_master_put() after controller deregistration which
would access the already freed spi controller.

Note that spi_unregister_master() drops our only controller reference.

Fixes: ba3e67001b42 ("greybus: SPI: convert to a gpbridge driver")
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/staging/greybus/spilib.c