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

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Message-Id: <1392674322-9036-9-git-send-email-john.stultz@linaro.org>
Date:	Mon, 17 Feb 2014 13:58:36 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Mitchel Humpherys <mitchelh@...eaurora.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Colin Cross <ccross@...roid.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 08/14] staging: ion: Store a copy of the client name on client creation

From: Mitchel Humpherys <mitchelh@...eaurora.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@...uxfoundation.org>
Cc: Colin Cross <ccross@...roid.com>
Cc: Android Kernel Team <kernel-team@...roid.com>
Signed-off-by: Mitchel Humpherys <mitchelh@...eaurora.org>
[jstultz: Minor commit subject tweaks]
Signed-off-by: John Stultz <john.stultz@...aro.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

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