From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D12D4255F52; Mon, 23 Mar 2026 15:03:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774278234; cv=none; b=AdsKfMz+w2MSU7pgAOlsb36CMsxnNSPA8Vz/pU0XTmpj7emkAlzmKvYPX4bJor0DLW6S3cZAEXvQMv8mV+BUQr3AzGOxYomuLb2O5aXlY2ZCvxalvNTjD5K6g5XB5NCRcHloGEPUjqKdwYHuN4ytpLiPNO6K7cF60V/Ddu/sqso= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774278234; c=relaxed/simple; bh=2gDugrjuEBfIaTnu/ke0rP76WCwVxSY8Fh1K95fDdOo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LDROzpNKA70r8hrH1lwwL2KYQSUJfShbp0TRVpDEum3AX/Nu1XstNe/Zc2pcuVPCiIx2Oa1fWTmjUElGhT9xGhd6pqyVPZGV2QRFt47C+sxAtZlX3NGr4CL9r5ioxl4RfZuanAsQLbmnMLeF7PlVTWtUCJ+mUX2vO6eD6Ua90qQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=dxkK5jPS; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="dxkK5jPS" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4AAB8C4CEF7; Mon, 23 Mar 2026 15:03:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774278234; bh=2gDugrjuEBfIaTnu/ke0rP76WCwVxSY8Fh1K95fDdOo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dxkK5jPSL7zA5E6H8Jtk7q6TGY8Pds65YByv2S9XSy98agBcMtRZAJ/09BNBDcHUu HSnaB1YSB03G8Lf4Zcmm9882AhRRAhNxLkW7o3rwStHV1Pr7sI6acG7BwzK7u/FwQz F+0DwyxxpLLae46Fn6fOpW0jIne17rx2iBhGCCK0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yifan Wu , Juefei Pu , Yuan Tan , Xin Liu , Florian Westphal , Sasha Levin Subject: [PATCH 6.6 244/567] netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels Date: Mon, 23 Mar 2026 14:42:44 +0100 Message-ID: <20260323134539.870315667@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260323134533.749096647@linuxfoundation.org> References: <20260323134533.749096647@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yuan Tan [ Upstream commit 329f0b9b48ee6ab59d1ab72fef55fe8c6463a6cf ] IDLETIMER revision 0 rules reuse existing timers by label and always call mod_timer() on timer->timer. If the label was created first by revision 1 with XT_IDLETIMER_ALARM, the object uses alarm timer semantics and timer->timer is never initialized. Reusing that object from revision 0 causes mod_timer() on an uninitialized timer_list, triggering debugobjects warnings and possible panic when panic_on_warn=1. Fix this by rejecting revision 0 rule insertion when an existing timer with the same label is of ALARM type. Fixes: 68983a354a65 ("netfilter: xtables: Add snapshot of hardidletimer target") Co-developed-by: Yifan Wu Signed-off-by: Yifan Wu Co-developed-by: Juefei Pu Signed-off-by: Juefei Pu Signed-off-by: Yuan Tan Signed-off-by: Xin Liu Signed-off-by: Florian Westphal Signed-off-by: Sasha Levin --- net/netfilter/xt_IDLETIMER.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/net/netfilter/xt_IDLETIMER.c b/net/netfilter/xt_IDLETIMER.c index 9869ef3c2ab37..92a8289b1cb35 100644 --- a/net/netfilter/xt_IDLETIMER.c +++ b/net/netfilter/xt_IDLETIMER.c @@ -320,6 +320,12 @@ static int idletimer_tg_checkentry(const struct xt_tgchk_param *par) info->timer = __idletimer_tg_find_by_label(info->label); if (info->timer) { + if (info->timer->timer_type & XT_IDLETIMER_ALARM) { + pr_debug("Adding/Replacing rule with same label and different timer type is not allowed\n"); + mutex_unlock(&list_mutex); + return -EINVAL; + } + info->timer->refcnt++; mod_timer(&info->timer->timer, msecs_to_jiffies(info->timeout * 1000) + jiffies); -- 2.51.0