This is a note to let you know that I've just added the patch titled
spi: spidev: fix possible NULL dereference
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
spi-spidev-fix-possible-null-dereference.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From dd85ebf681ef0ee1fc985c353dd45e8b53b5dc1e Mon Sep 17 00:00:00 2001
From: Sudip Mukherjee <[email protected]>
Date: Thu, 10 Sep 2015 16:48:13 +0530
Subject: spi: spidev: fix possible NULL dereference
From: Sudip Mukherjee <[email protected]>
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 <[email protected]>
Reviewed-by: Jarkko Nikula <[email protected]>
Tested-by: Jarkko Nikula <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/spi/spidev.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -664,7 +664,8 @@ static int spidev_release(struct inode *
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);
Patches currently in stable-queue which might be from
[email protected] are
queue-4.1/spi-spidev-fix-possible-null-dereference.patch
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