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thermal: of: fix double-free on unregistration
Since commit3d439b1a2a
("thermal/core: Alloc-copy-free the thermal zone parameters structure"), thermal_zone_device_register() allocates a copy of the tzp argument and frees it when unregistering, so thermal_of_zone_register() now ends up leaking its original tzp and double-freeing the tzp copy. Fix this by locating tzp on stack instead. Fixes:3d439b1a2a
("thermal/core: Alloc-copy-free the thermal zone parameters structure") Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: 6.4+ <stable@vger.kernel.org> # 6.4+: 8bcbb18c61d6: thermal: core: constify params in thermal_zone_device_register Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
parent
80ddce5f2d
commit
ac4436a5b2
1 changed files with 6 additions and 21 deletions
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@ -238,17 +238,13 @@ static int thermal_of_monitor_init(struct device_node *np, int *delay, int *pdel
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return 0;
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}
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static struct thermal_zone_params *thermal_of_parameters_init(struct device_node *np)
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static void thermal_of_parameters_init(struct device_node *np,
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struct thermal_zone_params *tzp)
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{
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struct thermal_zone_params *tzp;
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int coef[2];
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int ncoef = ARRAY_SIZE(coef);
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int prop, ret;
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tzp = kzalloc(sizeof(*tzp), GFP_KERNEL);
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if (!tzp)
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return ERR_PTR(-ENOMEM);
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tzp->no_hwmon = true;
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if (!of_property_read_u32(np, "sustainable-power", &prop))
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@ -267,8 +263,6 @@ static struct thermal_zone_params *thermal_of_parameters_init(struct device_node
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tzp->slope = coef[0];
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tzp->offset = coef[1];
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return tzp;
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}
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static struct device_node *thermal_of_zone_get_by_name(struct thermal_zone_device *tz)
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@ -442,13 +436,11 @@ static int thermal_of_unbind(struct thermal_zone_device *tz,
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static void thermal_of_zone_unregister(struct thermal_zone_device *tz)
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{
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struct thermal_trip *trips = tz->trips;
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struct thermal_zone_params *tzp = tz->tzp;
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struct thermal_zone_device_ops *ops = tz->ops;
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thermal_zone_device_disable(tz);
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thermal_zone_device_unregister(tz);
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kfree(trips);
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kfree(tzp);
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kfree(ops);
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}
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@ -477,7 +469,7 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
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{
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struct thermal_zone_device *tz;
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struct thermal_trip *trips;
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struct thermal_zone_params *tzp;
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struct thermal_zone_params tzp = {};
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struct thermal_zone_device_ops *of_ops;
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struct device_node *np;
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int delay, pdelay;
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@ -509,12 +501,7 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
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goto out_kfree_trips;
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}
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tzp = thermal_of_parameters_init(np);
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if (IS_ERR(tzp)) {
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ret = PTR_ERR(tzp);
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pr_err("Failed to initialize parameter from %pOFn: %d\n", np, ret);
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goto out_kfree_trips;
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}
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thermal_of_parameters_init(np, &tzp);
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of_ops->bind = thermal_of_bind;
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of_ops->unbind = thermal_of_unbind;
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@ -522,12 +509,12 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
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mask = GENMASK_ULL((ntrips) - 1, 0);
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tz = thermal_zone_device_register_with_trips(np->name, trips, ntrips,
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mask, data, of_ops, tzp,
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mask, data, of_ops, &tzp,
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pdelay, delay);
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if (IS_ERR(tz)) {
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ret = PTR_ERR(tz);
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pr_err("Failed to register thermal zone %pOFn: %d\n", np, ret);
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goto out_kfree_tzp;
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goto out_kfree_trips;
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}
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ret = thermal_zone_device_enable(tz);
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@ -540,8 +527,6 @@ static struct thermal_zone_device *thermal_of_zone_register(struct device_node *
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return tz;
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out_kfree_tzp:
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kfree(tzp);
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out_kfree_trips:
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kfree(trips);
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out_kfree_of_ops:
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