4.4-stable review patch. If anyone has any objections, please let me know.
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From: Dan Carpenter dan.carpenter@oracle.com
[ Upstream commit 216c4e9db4c9d1d2a382b42880442dc632cd47d9 ]
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 Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/powercap/powercap_sys.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/powercap/powercap_sys.c +++ b/drivers/powercap/powercap_sys.c @@ -538,6 +538,7 @@ struct powercap_zone *powercap_register_
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;