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 AB83015D1; Sat, 7 Jun 2025 10:11:19 +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=1749291079; cv=none; b=LhKNRJP3WzRcSzlichefUuYjLEc+o+qe8e9pzjfl2j7vIUnQKlbDvJS8Q/WVCdUxaukRRD2ZZ0LOjsv88NMkU47yvCrgwdrlBFsxZdCIJ9mH8WR9XfP0upulvsrkctpeZUeVlLd3d9cYYfJqvDnLQEsUbxccyAF7qNkFhZRehpk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749291079; c=relaxed/simple; bh=AaimcjWerws4ZCe43Bm5mqFykhSB1drho7vXX0mWE0E=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BOINLiKhJ1Ry+04AontuL8qZe6LpeCXITbMe8PKxzkrszhcyI8gQUqfxhsF5G3gT4Dxt1A1a4OBZ7AW4lbwu2RG7LAqztgoAVctL6uME4Sx2sDN4Z8945N51WAQLt/+IvrMyP+DJg0pAF4JrX9xp+KILM8xo+UzJXGk2zzSgemI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=CB59NTyn; 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="CB59NTyn" Received: by smtp.kernel.org (Postfix) with ESMTPSA id F2224C4CEE4; Sat, 7 Jun 2025 10:11:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1749291079; bh=AaimcjWerws4ZCe43Bm5mqFykhSB1drho7vXX0mWE0E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CB59NTyn5AiRCd6PXPHQTuuSvlcoMv6IL+BU8MuyORGPJcaslFuQ7JDk1w8GVa7VV 2zHNSmCTIcRrFa3FSxBZp0nLYwJqJu9qZlscP5nttncY/g81HYkKsN2MXvkhvRjFu6 o+Sk1SAKYYgRr67yg6tW4BqSi6SKDReYlG7ZYYHM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Sergey Senozhatsky , Mika Westerberg Subject: [PATCH 6.15 29/34] thunderbolt: Do not double dequeue a configuration request Date: Sat, 7 Jun 2025 12:08:10 +0200 Message-ID: <20250607100720.854417214@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250607100719.711372213@linuxfoundation.org> References: <20250607100719.711372213@linuxfoundation.org> User-Agent: quilt/0.68 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 6.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sergey Senozhatsky commit 0f73628e9da1ee39daf5f188190cdbaee5e0c98c upstream. Some of our devices crash in tb_cfg_request_dequeue(): general protection fault, probably for non-canonical address 0xdead000000000122 CPU: 6 PID: 91007 Comm: kworker/6:2 Tainted: G U W 6.6.65 RIP: 0010:tb_cfg_request_dequeue+0x2d/0xa0 Call Trace: ? tb_cfg_request_dequeue+0x2d/0xa0 tb_cfg_request_work+0x33/0x80 worker_thread+0x386/0x8f0 kthread+0xed/0x110 ret_from_fork+0x38/0x50 ret_from_fork_asm+0x1b/0x30 The circumstances are unclear, however, the theory is that tb_cfg_request_work() can be scheduled twice for a request: first time via frame.callback from ring_work() and second time from tb_cfg_request(). Both times kworkers will execute tb_cfg_request_dequeue(), which results in double list_del() from the ctl->request_queue (the list poison deference hints at it: 0xdead000000000122). Do not dequeue requests that don't have TB_CFG_REQUEST_ACTIVE bit set. Signed-off-by: Sergey Senozhatsky Cc: stable@vger.kernel.org Signed-off-by: Mika Westerberg Signed-off-by: Greg Kroah-Hartman --- drivers/thunderbolt/ctl.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/thunderbolt/ctl.c +++ b/drivers/thunderbolt/ctl.c @@ -151,6 +151,11 @@ static void tb_cfg_request_dequeue(struc struct tb_ctl *ctl = req->ctl; mutex_lock(&ctl->request_queue_lock); + if (!test_bit(TB_CFG_REQUEST_ACTIVE, &req->flags)) { + mutex_unlock(&ctl->request_queue_lock); + return; + } + list_del(&req->list); clear_bit(TB_CFG_REQUEST_ACTIVE, &req->flags); if (test_bit(TB_CFG_REQUEST_CANCELED, &req->flags))