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staging: greybus: spilib: fix use-after-free after deregistration 

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: ba3e67001b ("greybus: SPI: convert to a gpbridge driver")
Cc: stable <stable@vger.kernel.org>     # 4.9
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>
This commit is contained in:
Johan Hovold 2017-10-29 13:01:33 +01:00 committed by Greg Kroah-Hartman
parent 1dc2f73a17
commit 770b03c2ca
1 changed files with 5 additions and 3 deletions
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8
drivers/staging/greybus/spilib.c
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@ -544,11 +544,14 @@ int gb_spilib_master_init(struct gb_connection *connection, struct device *dev,
return 0;
exit_spi_unregister:
spi_unregister_master(master);
exit_spi_put:
spi_master_put(master);
return ret;
exit_spi_unregister:
spi_unregister_master(master);
return ret;
}
EXPORT_SYMBOL_GPL(gb_spilib_master_init);
@ -558,7 +561,6 @@ void gb_spilib_master_exit(struct gb_connection *connection)
struct spi_master *master = gb_connection_get_data(connection);
spi_unregister_master(master);
spi_master_put(master);
}
EXPORT_SYMBOL_GPL(gb_spilib_master_exit);