Commit a5462da5a349 for kernel

commit a5462da5a349fc7f17ad5ebd899380260d03e7ed
Author: David Howells <dhowells@redhat.com>
Date:   Wed Jun 24 17:38:18 2026 +0100

    rxrpc: Fix rxrpc_rotate_tx_rotate() to check there's something to rotate

    Fix rxrpc_rotate_tx_rotate() to check that there's something in the
    transmission buffer to be rotated before it attempts to rotate anything.

    Fixes: b341a0263b1b ("rxrpc: Implement progressive transmission queue struct")
    Link: https://sashiko.dev/#/patchset/20260618134802.2477777-1-dhowells%40redhat.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/20260624163819.3017002-12-dhowells@redhat.com
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 9bd0f1b92463..73cafe6bfa9f 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -237,6 +237,9 @@ static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to,
 		call->acks_lowest_nak = to;
 	}

+	if (after(seq, to))
+		return false;
+
 	/* We may have a left over fully-consumed buffer at the front that we
 	 * couldn't drop before (rotate_and_keep below).
 	 */