Describe CVE-2021-47538.
What is CVE-2021-47538?
In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix rxrpc_local leak in rxrpc_lookup_peer()

Need to call rxrpc_put_local() for peer candidate before kfree() as it
holds a ref to rxrpc_local.

[DH: v2: Changed to abstract the peer freeing code out into a function].