From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793211627; b=4ESHndhrjmZlDuBGBtyO75pWdV4SHj8GmRvJtW9KTop6YHIposkWHQhYwY/8Zpgp817p LqWsBJyJKxdv2jM2n54PFkr2VZMBw8gKBFUkNKjvuP7N8kUs9t9BB/L91yusYKvJa9sXB 1d9QCEcpzN3Ue5uTcYlKz6SaX1JCsGGTvXfTek5FPFL4yE9I0absTUL8kKurhoLF4Zu+a MB0dLTokDkIpvt6lgiFc9Z0uL3yuVkLCjCQGGj6jHaQQ4oCKfLvfk7POO6uL9c/3z246F Xbo/OqTrnI65BUfvOowjATzNZYteHWiNx6YF9N3EUlP/cxtPBMkq1g3pGSfoHQ5VH7Q== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793211627; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=O1LUFVW58NyGeKLuoalCTlRjyUkAyD+jg90DHFpy+IY=; b=yaZmTvpXn0KVOYQLIVRix2cRxznY3FxtaljYgEiu0GrdUJss0AQdq5StoF3YaYjZTA8G lbCdhfvI8DNE3KjYDUb6kdLz9xMIgQeHx2bYwx09eU1UFDbvhH1GJ7vvr+N0FvuDXjozc 725k47BlR9ya4hoTm9NKH9wtGQttvfdYTSQvXUH6lcDsF/Lo+kjpdsLPJCjOMdnryxAHL try9oectfIeJoXfdMErE50douY1CioR+vjLD8ZfIe2K0hx8LxVSzi5vcsaZmA4erg9dib wjNr0PmGoEvsILOuY35E+RKwLsXE9ONWAJNPFnUZvBdAdiP7+UCMHi1B4HpLqHkBNeA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b="YHCV/cwD"; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 046D4606A31A; Wed, 28 Oct 2026 18:20:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=YHCV/cwD Received: by smtp.kernel.org (Postfix) with ESMTPSA id 559E31F01825; Wed, 28 Oct 2026 18:20:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1793211626; bh=O1LUFVW58NyGeKLuoalCTlRjyUkAyD+jg90DHFpy+IY=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=YHCV/cwDwbSVh8BklGrMZyFGd/QvH2+7LiJptCINZ0YWdig2wf4FmmSPsArmUESYi iYMg7qICX1Dlm7dClZG8K+4c2GB8Dl8t3e8h3kqVSthbbqO6dOJ4ygpvFxY7jPJo5i oW3jzKXkhIy/HHJJzwoY0Kd0hU1CEhP8hIOQA9GI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Shao-Fu Chen , Jens Wiklander , Sasha Levin Subject: [PATCH 5.15 443/571] optee: register TEE devices only once fully initialized Date: Wed, 28 Oct 2026 17:59:50 +0100 Message-ID: <20261028170018.537253034@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261028170008.009143722@linuxfoundation.org> References: <20261028170008.009143722@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Shao-Fu Chen [ Upstream commit c108feca0a096f8db25d1b69130035025e9e936d ] optee_probe() called tee_device_register() on both the client and the supplicant device before the rest of struct optee had been initialized. tee_device_register() calls cdev_device_add(), which does two things at once: it creates /dev/tee0 and /dev/teepriv0, and it links the device into the tee class so that class_find_device() can find it. From that moment on the device is reachable both from user space via tee_open() and from kernel space via tee_client_open_context(). The only gate in teedev_open() is tee_device_get(), which merely checks that teedev->desc is non-NULL, which was already set by tee_device_alloc(). Therefore, there is effectively no gate at all. A context opened in that window can run against a struct optee where - optee->call_queue.mutex is not initialized by optee_cq_init() - optee->supp mutex and completions is not initialized by optee_supp_init() - optee->rpmb_dev_mutex is not initialized yet, - the message argument cache is not initialized by optee_shm_arg_cache_init() - optee->ctx is still NULL Any open session or invoke during this window takes uninitialized mutexes and dereferences a NULL pointer. Fix it by moving both tee_device_register() calls down to the point where all of struct optee is set up. Fixes: 4fb0a5eb364d ("tee: add OP-TEE driver") Cc: stable@vger.kernel.org Signed-off-by: Shao-Fu Chen [JW: adding fixes and cc] Signed-off-by: Jens Wiklander [ sashal: Adapted the fix to the existing optee_probe() implementation using optee_remove() for cleanup. ] Signed-off-by: Sasha Levin --- drivers/tee/optee/core.c | 26 ++++++++++++++------------ 1 file changed, 14 insertions(+), 12 deletions(-) diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index 50c0d839fe751..a1bb5652d9081 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -707,14 +707,6 @@ static int optee_probe(struct platform_device *pdev) } optee->supp_teedev = teedev; - rc = tee_device_register(optee->teedev); - if (rc) - goto err; - - rc = tee_device_register(optee->supp_teedev); - if (rc) - goto err; - mutex_init(&optee->call_queue.mutex); INIT_LIST_HEAD(&optee->call_queue.waiters); optee_wait_queue_init(&optee->wait_queue); @@ -744,14 +736,24 @@ static int optee_probe(struct platform_device *pdev) platform_set_drvdata(pdev, optee); + rc = tee_device_register(optee->teedev); + if (rc) + goto err_remove; + + rc = tee_device_register(optee->supp_teedev); + if (rc) + goto err_remove; + rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES); - if (rc) { - optee_remove(pdev); - return rc; - } + if (rc) + goto err_remove; pr_info("initialized driver\n"); return 0; + +err_remove: + optee_remove(pdev); + return rc; err: if (optee) { /* -- 2.53.0