rxrpc: Fix rxrpc_input_call_event() to only unshare DATA packets

cve-pre CVE-2026-43500
commit-author David Howells <dhowells@redhat.com>
commit 55b2984

Fix rxrpc_input_call_event() to only unshare DATA packets and not ACK,
ABORT, etc..

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.

Fixes: 1f27401 ("rxrpc: Fix potential UAF after skb_unshare() failure")
Closes: https://sashiko.dev/#/patchset/20260422161438.2593376-4-dhowells@redhat.com
	Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: Jeffrey Altman <jaltman@auristor.com>
cc: Simon Horman <horms@kernel.org>
cc: linux-afs@lists.infradead.org
cc: stable@kernel.org
Link: https://patch.msgid.link/20260423200909.3049438-2-dhowells@redhat.com
	Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 55b2984)
	Signed-off-by: Sultan Alsawaf <sultan@ciq.com>

Author: kerneltoast

net/rxrpc/call_event.c

@@ -401,7 +401,8 @@ bool rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 	if (skb) {
 		struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
 
-		if (sp->hdr.securityIndex != 0 &&
+		if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
+		    sp->hdr.securityIndex != 0 &&
 		    skb_cloned(skb)) {
 			/* Unshare the packet so that it can be
 			 * modified by in-place decryption.