linux-kernel - [PATCH 1/1] Fix Kernel Panic due to dereference of the invalid handle. First validate the handle and then derefer it in BUG

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Date:	Sat, 17 Jan 2015 11:42:41 +0530
From:	Shailendra Verma <shailendra.capricorn@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	John Stultz <john.stultz@...aro.org>,
	Mitchel Humpherys <mitchelh@...eaurora.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org,
	Shailendra Verma <shailendra.capricorn@...il.com>
Subject: [PATCH 1/1] Fix Kernel Panic due to dereference of the invalid handle. First validate the handle and then derefer it in BUG_ON.


Signed-off-by: Shailendra Verma <shailendra.capricorn@...il.com>
---
 drivers/staging/android/ion/ion.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 296d347..9e56d32 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -536,8 +536,6 @@ void ion_free(struct ion_client *client, struct ion_handle *handle)
 {
 	bool valid_handle;

-	BUG_ON(client != handle->client);
-
 	mutex_lock(&client->lock);
 	valid_handle = ion_handle_validate(client, handle);

@@ -547,6 +545,7 @@ void ion_free(struct ion_client *client, struct ion_handle *handle)
 		return;
 	}
 	mutex_unlock(&client->lock);
+	BUG_ON(client != handle->client);
 	ion_handle_put(handle);
 }
 EXPORT_SYMBOL(ion_free);
--
1.7.9.5

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