PowerCap: Fix an error code in powercap_register_zone()
authorDan Carpenter <dan.carpenter@oracle.com>
Wed, 10 May 2017 19:40:06 +0000 (22:40 +0300)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Sun, 14 May 2017 11:30:05 +0000 (13:30 +0200)
In the current code we accidentally return the successful result from
idr_alloc() instead of a negative error pointer.  The caller is looking
for an error pointer and so it treats the returned value as a valid
pointer.

This one might be a bit serious because if it lets people get around the
kernel's protection for remapping NULL.  I'm not sure.

Fixes: 75d2364ea0ca (PowerCap: Add class driver)
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/powercap/powercap_sys.c

index 14bde0db8c245680fd010bf2f0aa39093af5a4c2..5b10b50f8686f953a5fe476f3131b0d8a42307bb 100644 (file)
@@ -538,6 +538,7 @@ struct powercap_zone *powercap_register_zone(
 
        power_zone->id = result;
        idr_init(&power_zone->idr);
+       result = -ENOMEM;
        power_zone->name = kstrdup(name, GFP_KERNEL);
        if (!power_zone->name)
                goto err_name_alloc;