3.19.8-ckt9 -stable review patch. If anyone has any objections, please let me
know.
------------------
From: Sudip Mukherjee <sudipm.mukher...@gmail.com>
commit dd85ebf681ef0ee1fc985c353dd45e8b53b5dc1e upstream.
During the last close we are freeing spidev if spidev->spi is NULL, but
just before checking if spidev->spi is NULL we are dereferencing it.
Lets add a check there to avoid the NULL dereference.
Fixes: 9169051617df ("spi: spidev: Don't mangle max_speed_hz in underlying spi
device")
Signed-off-by: Sudip Mukherjee <su...@vectorindia.org>
Reviewed-by: Jarkko Nikula <jarkko.nik...@linux.intel.com>
Tested-by: Jarkko Nikula <jarkko.nik...@linux.intel.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
drivers/spi/spidev.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index 5c85435..e0bec45 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -579,7 +579,8 @@ static int spidev_release(struct inode *inode, struct file
*filp)
kfree(spidev->rx_buffer);
spidev->rx_buffer = NULL;
- spidev->speed_hz = spidev->spi->max_speed_hz;
+ if (spidev->spi)
+ spidev->speed_hz = spidev->spi->max_speed_hz;
/* ... after we unbound from the underlying device? */
spin_lock_irq(&spidev->spi_lock);
--
1.9.1
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