CVE-2026-45998

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

rxrpc: Fix potential UAF after skb_unshare() failure

If skb_unshare() fails to unshare a packet due to allocation failure in

rxrpc_input_packet(), the skb pointer in the parent (rxrpc_io_thread())

will be NULL'd out. This will likely cause the call to

trace_rxrpc_rx_done() to oops.

Fix this by moving the unsharing down to where rxrpc_input_call_event()

calls rxrpc_input_call_packet(). There are a number of places prior to

that where we ignore DATA packets for a variety of reasons (such as the

call already being complete) for which an unshare is then avoided.

And with that, rxrpc_input_packet() doesn't need to take a pointer to the

pointer to the packet, so change that to just a pointer.