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| author |   Peter Hüwe <PeterHuewe@gmx.de> | 2014-09-12 21:09:47 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2014-09-25 16:08:15 +0200 |
| commit | 0aef44e84ad16cd87a88df78773fd81ecca34f11 (patch) | |
| tree | c50a07ae7431e7cc42117f34afc070fb195dc488 /drivers/i2c/i2c-core.c | |
| parent | i2c: move acpi code back into the core (diff) | |
| download | linux-dev-0aef44e84ad16cd87a88df78773fd81ecca34f11.tar.xz linux-dev-0aef44e84ad16cd87a88df78773fd81ecca34f11.zip | |
i2c: acpi: Fix NULL Pointer dereference
If adapter->dev.parent == NULL there is a NULL pointer dereference in
acpi_i2c_install_space_handler and acpi_i2c_remove_space_handler.
This is present since introduction of this code:
366047515c6e "i2c: rework kernel config I2C_ACPI" or even
da3c6647ee08 "I2C/ACPI: Clean up I2C ACPI code and Add CONFIG_I2C_ACPI"
The adapter->dev.parent == NULL case is valid for the i2c_stub,
so loading i2c_stub with ACPI_I2C_OPREGION enabled results in an oops.
This is also valid at least for i2c_tiny_usb and i2c_robotfuzz_osif.
Fix by checking whether it is null before calling ACPI_HANDLE.
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/i2c-core.c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index b696ac7e6d86..ccfbbab82a15 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -371,10 +371,15 @@ acpi_i2c_space_handler(u32 function, acpi_physical_address command, static int acpi_i2c_install_space_handler(struct i2c_adapter *adapter) { - acpi_handle handle = ACPI_HANDLE(adapter->dev.parent); + acpi_handle handle; struct acpi_i2c_handler_data *data; acpi_status status; + if (!adapter->dev.parent) + return -ENODEV; + + handle = ACPI_HANDLE(adapter->dev.parent); + if (!handle) return -ENODEV; @@ -407,10 +412,15 @@ static int acpi_i2c_install_space_handler(struct i2c_adapter *adapter) static void acpi_i2c_remove_space_handler(struct i2c_adapter *adapter) { - acpi_handle handle = ACPI_HANDLE(adapter->dev.parent); + acpi_handle handle; struct acpi_i2c_handler_data *data; acpi_status status; + if (!adapter->dev.parent) + return; + + handle = ACPI_HANDLE(adapter->dev.parent); + if (!handle) return; |