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Change History

In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix key reference count leak from call->key

When creating a client call in rxrpc_alloc_client_call(), the code obtains
a reference to the key.  This is never cleaned up and gets leaked when the
call is destroyed.

Fix this by freeing call->key in rxrpc_destroy_call().

Before the patch, it shows the key reference counter elevated:

$ cat /proc/keys | grep afs@54321
1bffe9cd I--Q--i 8053480 4169w 3b010000  1000  1000 rxrpc     afs@54321: ka
$

After the patch, the invalidated key is removed when the code exits:

$ cat /proc/keys | grep afs@54321
$

https://git.kernel.org/stable/c/2e6ef713b1598f6acd7f302fa6b12b6731c89914

https://git.kernel.org/stable/c/978108902ee4ef2b348ff7ec36ad014dc5bc6dc6

https://git.kernel.org/stable/c/d666540d217e8d420544ebdfbadeedd623562733

https://git.kernel.org/stable/c/e6b7943c5dc875647499da09bf4d50a8557ab0c3

https://git.kernel.org/stable/c/f1a7a3ab0f35f83cf11bba906b9e948cf3788c28