[PATCH 08/14] staging: ion: Store a copy of the client name on client creation

John Stultz
2014-02-17T21:59:09Z

From: Mitchel Humpherys <mitchelh@codeaurora.org>

Currently, we copy the pointer passed in to ion_client_create without
making a copy of the string itself. This approach is problematic since
it relies on the client keeping the name string in working order.

Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Colin Cross <ccross@android.com>
Cc: Android Kernel Team <kernel-team@android.com>
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>
[jstultz: Minor commit subject tweaks]
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
drivers/staging/android/ion/ion.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 4869420..eac4bce 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -735,19 +735,18 @@ struct ion_client *ion_client_create(struct ion_device *dev,
task_unlock(current->group_leader);

client = kzalloc(sizeof(struct ion_client), GFP_KERNEL);
- if (!client) {
- if (task)
- put_task_struct(current->group_leader);
- return ERR_PTR(-ENOMEM);
- }
+ if (!client)
+ goto err_put_task_struct;

client->dev = dev;
client->handles = RB_ROOT;
idr_init(&client->idr);
mutex_init(&client->lock);
- client->name = name;
client->task = task;
client->pid = pid;
+ client->name = kstrdup(name, GFP_KERNEL);
+ if (!client->name)
+ goto err_free_client;

down_write(&dev->lock);
p = &dev->clients.rb_node;
@@ -776,6 +775,13 @@ struct ion_client *ion_client_create(struct ion_device *dev,
up_write(&dev->lock);

return client;
+
+err_free_client:
+ kfree(client);
+err_put_task_struct:
+ if (task)
+ put_task_struct(current->group_leader);
+ return ERR_PTR(-ENOMEM);
}
EXPORT_SYMBOL(ion_client_create);

@@ -800,6 +806,7 @@ void ion_client_destroy(struct ion_client *client)
debugfs_remove_recursive(client->debug_root);
up_write(&dev->lock);

+ kfree(client->name);
kfree(client);
}
EXPORT_SYMBOL(ion_client_destroy);
--
1.8.3.2