From: Vamshi K Sthambamkadi vamshi.k.sthambamkadi@gmail.com
commit 627ead724eff33673597216f5020b72118827de4 upstream.
kmemleak reported backtrace: [<bbee0454>] kmem_cache_alloc_trace+0x128/0x260 [<6677f215>] i2c_acpi_install_space_handler+0x4b/0xe0 [<1180f4fc>] i2c_register_adapter+0x186/0x400 [<6083baf7>] i2c_add_adapter+0x4e/0x70 [<a3ddf966>] intel_gmbus_setup+0x1a2/0x2c0 [i915] [<84cb69ae>] i915_driver_probe+0x8d8/0x13a0 [i915] [<81911d4b>] i915_pci_probe+0x48/0x160 [i915] [<4b159af1>] pci_device_probe+0xdc/0x160 [<b3c64704>] really_probe+0x1ee/0x450 [<bc029f5a>] driver_probe_device+0x142/0x1b0 [<d8829d20>] device_driver_attach+0x49/0x50 [<de71f045>] __driver_attach+0xc9/0x150 [<df33ac83>] bus_for_each_dev+0x56/0xa0 [<80089bba>] driver_attach+0x19/0x20 [<cc73f583>] bus_add_driver+0x177/0x220 [<7b29d8c7>] driver_register+0x56/0xf0
In i2c_acpi_remove_space_handler(), a leak occurs whenever the "data" parameter is initialized to 0 before being passed to acpi_bus_get_private_data().
This is because the NULL pointer check in acpi_bus_get_private_data() (condition->if(!*data)) returns EINVAL and, in consequence, memory is never freed in i2c_acpi_remove_space_handler().
Fix the NULL pointer check in acpi_bus_get_private_data() to follow the analogous check in acpi_get_data_full().
Signed-off-by: Vamshi K Sthambamkadi vamshi.k.sthambamkadi@gmail.com [ rjw: Subject & changelog ] Cc: All applicable stable@vger.kernel.org Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/acpi/bus.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -158,7 +158,7 @@ int acpi_bus_get_private_data(acpi_handl { acpi_status status;
- if (!*data) + if (!data) return -EINVAL;
status = acpi_get_data(handle, acpi_bus_private_data_handler, data);