Commit aa54b1d27fe0 for kernel

commit aa54b1d27fe0c2b78e664a34fd0fdf7cd1960d71
Author: Hyunwoo Kim <imv4bel@gmail.com>
Date:   Fri May 8 17:53:09 2026 +0900

    rxrpc: Also unshare DATA/RESPONSE packets when paged frags are present

    The DATA-packet handler in rxrpc_input_call_event() and the RESPONSE
    handler in rxrpc_verify_response() copy the skb to a linear one before
    calling into the security ops only when skb_cloned() is true.  An skb
    that is not cloned but still carries externally-owned paged fragments
    (e.g. SKBFL_SHARED_FRAG set by splice() into a UDP socket via
    __ip_append_data, or a chained skb_has_frag_list()) falls through to
    the in-place decryption path, which binds the frag pages directly into
    the AEAD/skcipher SGL via skb_to_sgvec().

    Extend the gate to also unshare when skb_has_frag_list() or
    skb_has_shared_frag() is true.  This catches the splice-loopback vector
    and other externally-shared frag sources while preserving the
    zero-copy fast path for skbs whose frags are kernel-private (e.g. NIC
    page_pool RX, GRO).  The OOM/trace handling already in place is reused.

    Fixes: d0d5c0cd1e71 ("rxrpc: Use skb_unshare() rather than skb_cow_data()")
    Cc: stable@vger.kernel.org
    Signed-off-by: Hyunwoo Kim <imv4bel@gmail.com>
    Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
    Acked-by: David Howells <dhowells@redhat.com>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index fdd683261226..2b19b252225e 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -334,7 +334,9 @@ bool rxrpc_input_call_event(struct rxrpc_call *call)

 			if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA &&
 			    sp->hdr.securityIndex != 0 &&
-			    skb_cloned(skb)) {
+			    (skb_cloned(skb) ||
+			     skb_has_frag_list(skb) ||
+			     skb_has_shared_frag(skb))) {
 				/* Unshare the packet so that it can be
 				 * modified by in-place decryption.
 				 */
diff --git a/net/rxrpc/conn_event.c b/net/rxrpc/conn_event.c
index a2130d25aaa9..442414d90ba1 100644
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -245,7 +245,8 @@ static int rxrpc_verify_response(struct rxrpc_connection *conn,
 {
 	int ret;

-	if (skb_cloned(skb)) {
+	if (skb_cloned(skb) || skb_has_frag_list(skb) ||
+	    skb_has_shared_frag(skb)) {
 		/* Copy the packet if shared so that we can do in-place
 		 * decryption.
 		 */