Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 9101B43B495; Mon, 17 Aug 2026 15:12:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786979526; cv=none; b=pI7lhfV/ir26eedjjy7bgK1QAN2AMOs9w1FLSomY7u1eOQWuHniVdynMfplxXJfm0t++tV1O/BoTINm8EvqnAHAj7cAU8yhbuWsEB0f7gRWRjCzq4TsXPsL04JBkRxoNoLGkBEFNvCV4pBWo0ltrOtgx4JL+iO2VnMPoTGmIA7Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786979526; c=relaxed/simple; bh=lqZtvc/adwzJLjYYfiD97hbxnuoe6TlZ0F6GUOb5pIg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=WCvaeR0H6j02X+9B28vey4LM+1zzwIchP/WjbBhInH3ygmA3SVDH4lH6nsYmYdmYT/CnC+LEVmScvy2pWZkExxwBmseqkV4Nd21hN58aoqUBN3kSFAUcWpUdlxjV2NQCO7imyQVVPDyopSd6rRcbmQUUEHRcympDKqUhcPvtH4A= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=rCir56CL; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="rCir56CL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D03FA1F00A3A; Mon, 17 Aug 2026 15:12:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1786979525; bh=Zz6D9EAOeGl7kM427QYYTnpa/dPrFkQAhXSVrFWtANE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rCir56CLsy2p3GPYinIND7wOWvRKzwH6QGY1bjmAW2NDsnL/MGk1jJVszT1x/EY5u 59qjpLl1Hzzxpt/1qeohEazsU4TyxYfRbAFwbhEaJaaO0QzbS52DN1GzbtoeKBXPLO jqgejVnk/deShQT1D9Rw6qZPJbZnGBU2L7TQ2cLk= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yuan Tan , Zhengchuan Liang , Xin Liu , Douya Le , Ren Wei , Viacheslav Dubeyko , Ilya Dryomov Subject: [PATCH 6.1 256/609] libceph: remove debugfs files before client teardown Date: Mon, 17 Aug 2026 15:29:12 +0200 Message-ID: <20260817132552.669718024@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260817132543.039278408@linuxfoundation.org> References: <20260817132543.039278408@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.1-stable review patch. If anyone has any objections, please let me know. ------------------ From: Douya Le commit e4c804726c4afce3ba648b982d564f6af2cfa328 upstream. ceph_destroy_client() tears down the monitor client before removing the per-client debugfs files. A concurrent read of the monmap debugfs file can enter monmap_show() after ceph_monc_stop() has freed monc->monmap, triggering a use-after-free. Remove the debugfs files before stopping the OSD and monitor clients. debugfs_remove() drains active handlers and prevents new accesses, so the debugfs callbacks can no longer race the rest of client teardown. Cc: stable@vger.kernel.org Fixes: 76aa844d5b2f ("ceph: debugfs") Reported-by: Yuan Tan Reported-by: Zhengchuan Liang Reported-by: Xin Liu Assisted-by: Codex:GPT-5.4 Signed-off-by: Douya Le Signed-off-by: Ren Wei Reviewed-by: Viacheslav Dubeyko Signed-off-by: Ilya Dryomov Signed-off-by: Greg Kroah-Hartman --- net/ceph/ceph_common.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/net/ceph/ceph_common.c +++ b/net/ceph/ceph_common.c @@ -763,13 +763,13 @@ void ceph_destroy_client(struct ceph_cli atomic_set(&client->msgr.stopping, 1); + ceph_debugfs_client_cleanup(client); + /* unmount */ ceph_osdc_stop(&client->osdc); ceph_monc_stop(&client->monc); ceph_messenger_fini(&client->msgr); - ceph_debugfs_client_cleanup(client); - ceph_destroy_options(client->options); kfree(client);