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| author | Vamshi K Sthambamkadi <vamshi.k.sthambamkadi@gmail.com> | 2019-11-28 13:28:29 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-12-21 12:42:05 +0300 |
| commit | 3f7e4f1639057840f41df5f2721b6670a9c440ce (patch) | |
| tree | af38612062fe387dfe663c79a8e300a541b2e02b /drivers/acpi/bus.c | |
| parent | 3f24ec5f5b32ee9f197e0b5897b1d6246adb74aa (diff) | |
| download | linux-3f7e4f1639057840f41df5f2721b6670a9c440ce.tar.xz | |
ACPI: bus: Fix NULL pointer check in acpi_bus_get_private_data()
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>
Diffstat (limited to 'drivers/acpi/bus.c')
| -rw-r--r-- | drivers/acpi/bus.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/acpi/bus.c b/drivers/acpi/bus.c index 0a3ca20f99af..6b2c9d68d810 100644 --- a/drivers/acpi/bus.c +++ b/drivers/acpi/bus.c @@ -158,7 +158,7 @@ int acpi_bus_get_private_data(acpi_handle handle, void **data) { acpi_status status; - if (!*data) + if (!data) return -EINVAL; status = acpi_get_data(handle, acpi_bus_private_data_handler, data); |