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| author | Guenter Roeck <linux@roeck-us.net> | 2012-08-18 09:29:24 -0700 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-08-22 19:26:36 +0100 |
| commit | 21879213652aca6e3fe250fc8e02c68e71c5e18a (patch) | |
| tree | e94afd325ba10f85e99d979e392ee498cd4bcad7 | |
| parent | c8c87c656f95d764eb2b460b46b0144794108da4 (diff) | |
| download | linux-21879213652aca6e3fe250fc8e02c68e71c5e18a.tar.gz linux-21879213652aca6e3fe250fc8e02c68e71c5e18a.tar.bz2 linux-21879213652aca6e3fe250fc8e02c68e71c5e18a.zip | |
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: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
| -rw-r--r-- | drivers/spi/spi-mpc512x-psc.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/spi/spi-mpc512x-psc.c b/drivers/spi/spi-mpc512x-psc.c index 4c63f772780a..0a1e39e94d06 100644 --- a/drivers/spi/spi-mpc512x-psc.c +++ b/drivers/spi/spi-mpc512x-psc.c @@ -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; } |