Patch "rxrpc: Fix rxrpc_rotate_tx_rotate() to check there's something to rotate" has been added to the 6.18-stable tree

[gregkh at linuxfoundation.org]

This is a note to let you know that I've just added the patch titled

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

to the 6.18-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     rxrpc-fix-rxrpc_rotate_tx_rotate-to-check-there-s-something-to-rotate.patch
and it can be found in the queue-6.18 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable at vger.kernel.org> know about it.


>From a5462da5a349fc7f17ad5ebd899380260d03e7ed Mon Sep 17 00:00:00 2001
From: David Howells <dhowells at redhat.com>
Date: Wed, 24 Jun 2026 17:38:18 +0100
Subject: rxrpc: Fix rxrpc_rotate_tx_rotate() to check there's something to rotate

From: David Howells <dhowells at redhat.com>

commit a5462da5a349fc7f17ad5ebd899380260d03e7ed upstream.

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 at redhat.com>
cc: Marc Dionne <marc.dionne at auristor.com>
cc: Jeffrey Altman <jaltman at auristor.com>
cc: Simon Horman <horms at kernel.org>
cc: linux-afs at lists.infradead.org
cc: stable at kernel.org
Link: https://patch.msgid.link/20260624163819.3017002-12-dhowells@redhat.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 net/rxrpc/input.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -236,6 +236,9 @@ static bool rxrpc_rotate_tx_window(struc
 		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).
 	 */


Patches currently in stable-queue which might be from dhowells at redhat.com are

queue-6.18/rxrpc-don-t-move-a-peeked-oob-message-onto-the-pending-queue.patch
queue-6.18/rxrpc-fix-potential-infinite-loop-in-rxrpc_recvmsg.patch
queue-6.18/rxrpc-rxrpc_verify_data-ensure-rx_dec_buffer-alloc.patch
queue-6.18/afs-fix-further-netns-teardown-to-cancel-the-preallocation-charger.patch
queue-6.18/afs-fix-netns-teardown-to-cancel-the-preallocation-charger.patch
queue-6.18/rxrpc-fix-ackall-packet-handling.patch
queue-6.18/rxrpc-fix-leak-of-connection-from-oob-challenge.patch
queue-6.18/rxrpc-fix-oob-challenge-leak-in-cleanup-after-notification-failure.patch
queue-6.18/afs-handle-cb.initcallbackstate3-requests-without-a-server-record.patch
queue-6.18/rxrpc-fix-socket-notification-race.patch
queue-6.18/rxrpc-fix-rxrpc_rotate_tx_rotate-to-check-there-s-something-to-rotate.patch
queue-6.18/rxrpc-fix-leak-of-released-call-in-recvmsg-msg_peek.patch
queue-6.18/rxrpc-serialize-kernel-accept-preallocation-with-socket-teardown.patch
queue-6.18/afs-fix-null-pointer-dereference-in-afs_get_tree.patch
queue-6.18/rxrpc-fix-the-reception-of-a-reply-packet-before-data-transmission.patch
queue-6.18/rxrpc-fix-double-unlock-in-rxrpc_recvmsg.patch
queue-6.18/afs-fix-uncancelled-rxrpc-oob-message-handler.patch
queue-6.18/rxrpc-fix-uaf-in-rxgk_issue_challenge.patch