CVE-2026-45998

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

rxrpc: Fix potential UAF after skb_unshare() failure

If skbunshare() fails to unshare a packet due to allocation failure in rxrpcinputpacket(), the skb pointer in the parent (rxrpciothread()) will be NULL'd out. This will likely cause the call to tracerxrpcrxdone() to oops.

Fix this by moving the unsharing down to where rxrpcinputcallevent() calls rxrpcinputcallpacket(). 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, rxrpcinputpacket() doesn't need to take a pointer to the pointer to the packet, so change that to just a pointer.