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Commit 21879213 authored by Guenter Roeck's avatar Guenter Roeck Committed by Mark Brown
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spi/mpc512x-psc: Avoid access to freed memory in device remove function 



The call to spi_unregister_master() in the device remove function frees device
memory, and with it any device local data. However, device local data is still
accessed after the call to spi_unregister_master().

Acquire a reference to the SPI master device and release it after cleanup is
complete to solve the problem.

Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
Signed-off-by: default avatarMark Brown <broonie@opensource.wolfsonmicro.com>
parent c8c87c65

drivers/spi/spi-mpc512x-psc.c

+2 −1
Original line number Diff line number Diff line
@@ -494,7 +494,7 @@ free_master: 


static int __devexit mpc512x_psc_spi_do_remove(struct device *dev)

{

	struct spi_master *master = dev_get_drvdata(dev);

	struct spi_master *master = spi_master_get(dev_get_drvdata(dev));

	struct mpc512x_psc_spi *mps = spi_master_get_devdata(master);



	flush_workqueue(mps->workqueue);
@@ -503,6 +503,7 @@ static int __devexit mpc512x_psc_spi_do_remove(struct device *dev) 
	free_irq(mps->irq, mps);

	if (mps->psc)

		iounmap(mps->psc);

	spi_master_put(master);



	return 0;

}