Revert "hwmon: (ibmpex) fix use-after-free in high/low store"

This reverts commit 6946c726c3f4c36f0f049e6f97e88c510b15f65d.

Jean Delvare points out that the patch does not completely
fix the reported problem, that it in fact introduces a
(new) race condition, and that it may actually not be needed in
the first place.

Various AI reviews agree. Specific and relevant AI feedback:

"
This reordering sets the driver data to NULL before removing the sensor
attributes in the loop below.

ibmpex_show_sensor() retrieves this driver data via dev_get_drvdata() but
does not check if it is NULL before dereferencing it to access
data->sensors[].

If a userspace process reads a sensor file (like temp1_input) while this
delete function is running, could it race with the dev_set_drvdata(...,
NULL) call here and crash in ibmpex_show_sensor()?

Would it be safer to keep the original order where device_remove_file() is
called before clearing the driver data? device_remove_file() should wait
for any active sysfs callbacks to complete, which might already prevent the
use-after-free this patch intends to fix.
"

Revert the offending patch. If it can be shown that the originally reported
alleged race condition does indeed exist, it can always be re-introduced
with a complete fix.

Reported-by: Jean Delvare <jdelvare@suse.de>
Closes: https://lore.kernel.org/linux-hwmon/20260121095342.73e723cb@endymion/
Cc: Jean Delvare <jdelvare@suse.de>
Cc: Junrui Luo <moonafterrain@outlook.com>
Fixes: 6946c726c3f4 ("hwmon: (ibmpex) fix use-after-free in high/low store")
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

diff --git a/drivers/hwmon/ibmpex.c b/drivers/hwmon/ibmpex.c
index 129f3a9e8fe965ae08d83d80677fa500495d5dd2..228c5f6c6f383688752caa7dc6a8a52b20261d50 100644 (file)
--- a/drivers/hwmon/ibmpex.c
+++ b/drivers/hwmon/ibmpex.c
@@ -277,9 +277,6 @@ static ssize_t ibmpex_high_low_store(struct device *dev,
 {
        struct ibmpex_bmc_data *data = dev_get_drvdata(dev);
 
-       if (!data)
-               return -ENODEV;
-
        ibmpex_reset_high_low_data(data);
 
        return count;
@@ -511,9 +508,6 @@ static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
 {
        int i, j;
 
-       hwmon_device_unregister(data->hwmon_dev);
-       dev_set_drvdata(data->bmc_device, NULL);
-
        device_remove_file(data->bmc_device,
                           &sensor_dev_attr_reset_high_low.dev_attr);
        device_remove_file(data->bmc_device, &dev_attr_name.attr);
@@ -527,7 +521,8 @@ static void ibmpex_bmc_delete(struct ibmpex_bmc_data *data)
                }
 
        list_del(&data->list);
-
+       dev_set_drvdata(data->bmc_device, NULL);
+       hwmon_device_unregister(data->hwmon_dev);
        ipmi_destroy_user(data->user);
        kfree(data->sensors);
        kfree(data);