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SubjectRe: [PATCH 05/24] hwmon: fix dangling pointers
On Sat, 20 Mar 2010 15:12:46 +0100, Wolfram Sang wrote:
> Fix I2C-drivers which missed setting clientdata to NULL before freeing the
> structure it points to. Also fix drivers which do this _after_ the structure
> was freed already.
>
> Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
> Cc: Jean Delvare <khali@linux-fr.org>
> Cc: Corentin Labbe <corentin.labbe@geomatys.fr>
> Cc: "Mark M. Hoffman" <mhoffman@lightlink.com>
> Cc: Juerg Haefliger <juergh@gmail.com>
> Cc: Riku Voipio <riku.voipio@iki.fi>
> Cc: "Hans J. Koch" <hjk@linutronix.de>
> Cc: Marc Hulsman <m.hulsman@tudelft.nl>
> Cc: Rudolf Marek <r.marek@assembler.cz>
> ---
>
> Found using coccinelle, then reviewed. Full patchset is available via
> kernel-janitors, linux-i2c, and LKML.
> ---
> drivers/hwmon/ad7414.c | 2 ++
> drivers/hwmon/ad7418.c | 2 ++
> drivers/hwmon/adm1021.c | 2 ++
> drivers/hwmon/adm1025.c | 2 ++
> drivers/hwmon/adm1026.c | 2 ++
> drivers/hwmon/adm1029.c | 2 ++
> drivers/hwmon/adm1031.c | 2 ++
> drivers/hwmon/adm9240.c | 2 ++
> drivers/hwmon/ads7828.c | 5 ++++-
> drivers/hwmon/adt7462.c | 2 ++
> drivers/hwmon/adt7470.c | 2 ++
> drivers/hwmon/adt7475.c | 2 ++
> drivers/hwmon/amc6821.c | 2 ++
> drivers/hwmon/asb100.c | 2 ++
> drivers/hwmon/atxp1.c | 2 ++
> drivers/hwmon/dme1737.c | 2 ++
> drivers/hwmon/ds1621.c | 2 ++
> drivers/hwmon/f75375s.c | 4 ++--
> drivers/hwmon/g760a.c | 4 ++--
> drivers/hwmon/gl518sm.c | 2 ++
> drivers/hwmon/gl520sm.c | 2 ++
> drivers/hwmon/lm63.c | 2 ++
> drivers/hwmon/lm77.c | 2 ++
> drivers/hwmon/lm78.c | 2 ++
> drivers/hwmon/lm80.c | 2 ++
> drivers/hwmon/lm83.c | 2 ++
> drivers/hwmon/lm85.c | 2 ++
> drivers/hwmon/lm87.c | 2 ++
> drivers/hwmon/lm90.c | 2 ++
> drivers/hwmon/lm92.c | 2 ++
> drivers/hwmon/lm93.c | 2 ++
> drivers/hwmon/lm95241.c | 1 +
> drivers/hwmon/ltc4215.c | 2 ++
> drivers/hwmon/ltc4245.c | 2 ++
> drivers/hwmon/max1619.c | 2 ++
> drivers/hwmon/max6650.c | 2 ++
> drivers/hwmon/pcf8591.c | 6 +++++-
> drivers/hwmon/smsc47m192.c | 2 ++
> drivers/hwmon/thmc50.c | 2 ++
> drivers/hwmon/tmp401.c | 1 +
> drivers/hwmon/w83791d.c | 2 ++
> drivers/hwmon/w83792d.c | 2 ++
> drivers/hwmon/w83793.c | 1 +
> drivers/hwmon/w83l785ts.c | 2 ++
> drivers/hwmon/w83l786ng.c | 2 ++
> 45 files changed, 92 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hwmon/ad7414.c b/drivers/hwmon/ad7414.c
> index bfda8c8..0cfae01 100644
> --- a/drivers/hwmon/ad7414.c
> +++ b/drivers/hwmon/ad7414.c
> @@ -220,6 +220,7 @@ static int ad7414_probe(struct i2c_client *client,
> exit_remove:
> sysfs_remove_group(&client->dev.kobj, &ad7414_group);
> exit_free:
> + i2c_set_clientdata(client, NULL);
> kfree(data);
> exit:
> return err;
> @@ -231,6 +232,7 @@ static int __devexit ad7414_remove(struct i2c_client *client)
>
> hwmon_device_unregister(data->hwmon_dev);
> sysfs_remove_group(&client->dev.kobj, &ad7414_group);
> + i2c_set_clientdata(client, NULL);
> kfree(data);
> return 0;
> }
> (...)

As discussed on the i2c list, I won't apply this patch. Instead, we
want i2c-core to call i2c_set_clientdata() after the remove() function
returns. This saves a lot of code duplication.

--
Jean Delvare


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