ACPI: dock: fix oops after dock driver fails to initialize
From: Chuck Ebbert <[EMAIL PROTECTED]>
The driver tests the dock_station pointer for nonnull
to check whether it has initialized properly. But in
some cases dock_station will be non-null after being
freed when driver init fails. Fix by zeroing the
pointer after freeing.
Signed-off-by: Chuck Ebbert <[EMAIL PROTECTED]>
Signed-off-by: Kristen Carlson Accardi <[EMAIL PROTECTED]>
---
drivers/acpi/dock.c | 6 ++++++
1 file changed, 6 insertions(+)
Index: 2.6-git/drivers/acpi/dock.c
===================================================================
--- 2.6-git.orig/drivers/acpi/dock.c
+++ 2.6-git/drivers/acpi/dock.c
@@ -715,6 +715,7 @@ static int dock_add(acpi_handle handle)
if (ret) {
printk(KERN_ERR PREFIX "Error %d registering dock device\n",
ret);
kfree(dock_station);
+ dock_station = NULL;
return ret;
}
ret = device_create_file(&dock_device.dev, &dev_attr_docked);
@@ -722,6 +723,7 @@ static int dock_add(acpi_handle handle)
printk("Error %d adding sysfs file\n", ret);
platform_device_unregister(&dock_device);
kfree(dock_station);
+ dock_station = NULL;
return ret;
}
ret = device_create_file(&dock_device.dev, &dev_attr_undock);
@@ -730,6 +732,7 @@ static int dock_add(acpi_handle handle)
device_remove_file(&dock_device.dev, &dev_attr_docked);
platform_device_unregister(&dock_device);
kfree(dock_station);
+ dock_station = NULL;
return ret;
}
ret = device_create_file(&dock_device.dev, &dev_attr_uid);
@@ -739,6 +742,7 @@ static int dock_add(acpi_handle handle)
device_remove_file(&dock_device.dev, &dev_attr_undock);
platform_device_unregister(&dock_device);
kfree(dock_station);
+ dock_station = NULL;
return ret;
}
@@ -751,6 +755,7 @@ static int dock_add(acpi_handle handle)
dd = alloc_dock_dependent_device(handle);
if (!dd) {
kfree(dock_station);
+ dock_station = NULL;
ret = -ENOMEM;
goto dock_add_err_unregister;
}
@@ -779,6 +784,7 @@ dock_add_err_unregister:
device_remove_file(&dock_device.dev, &dev_attr_uid);
platform_device_unregister(&dock_device);
kfree(dock_station);
+ dock_station = NULL;
return ret;
}
@@ -813,6 +819,7 @@ static int dock_remove(void)
/* free dock station memory */
kfree(dock_station);
+ dock_station = NULL;
return 0;
}
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
