From patchwork Wed Jun 7 20:16:38 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 13271269 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2B31EC7EE2E for ; Wed, 7 Jun 2023 20:46:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234886AbjFGUq3 (ORCPT ); Wed, 7 Jun 2023 16:46:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46726 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234893AbjFGUqO (ORCPT ); Wed, 7 Jun 2023 16:46:14 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 81AF826A5; Wed, 7 Jun 2023 13:45:56 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 0429764640; Wed, 7 Jun 2023 20:45:56 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E387BC4339B; Wed, 7 Jun 2023 20:45:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1686170755; bh=b4oGrHUU4PlZn58yeBa1vTwhXg4J0f1XcSHjsV6FHiY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OanPyMD4jNvQqWbXRJsI/VPVTsUKqz/Db4UmpAZjNWIy7grP8EuiN1Btoz77lwYQ5 Q0NRcHP2vNYoiREuNIY38Pp+v8kzXnZyF/C3u3sEzLXxPuZ1KRjKzERgIhmSQB1zSh Wq/eXElGlNhGXTHfMYpcnafvAgRUezitrXHu+OKo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Mirsad Goran Todorovac , Dan Carpenter , Takashi Iwai , Luis Chamberlain , Russ Weight , Tianfei zhang , Christophe JAILLET , Zhengchao Shao , Colin Ian King , linux-kernel@vger.kernel.org, Kees Cook , Scott Branden , linux-kselftest@vger.kernel.org Subject: [PATCH 6.1 205/225] test_firmware: fix the memory leak of the allocated firmware buffer Date: Wed, 7 Jun 2023 22:16:38 +0200 Message-ID: <20230607200921.070241596@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230607200913.334991024@linuxfoundation.org> References: <20230607200913.334991024@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Mirsad Goran Todorovac commit 48e156023059e57a8fc68b498439832f7600ffff upstream. The following kernel memory leak was noticed after running tools/testing/selftests/firmware/fw_run_tests.sh: [root@pc-mtodorov firmware]# cat /sys/kernel/debug/kmemleak . . . unreferenced object 0xffff955389bc3400 (size 1024): comm "test_firmware-0", pid 5451, jiffies 4294944822 (age 65.652s) hex dump (first 32 bytes): 47 48 34 35 36 37 0a 00 00 00 00 00 00 00 00 00 GH4567.......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] slab_post_alloc_hook+0x8c/0x3c0 [] __kmem_cache_alloc_node+0x184/0x240 [] kmalloc_trace+0x2e/0xc0 [] test_fw_run_batch_request+0x9d/0x180 [] kthread+0x10b/0x140 [] ret_from_fork+0x29/0x50 unreferenced object 0xffff9553c334b400 (size 1024): comm "test_firmware-1", pid 5452, jiffies 4294944822 (age 65.652s) hex dump (first 32 bytes): 47 48 34 35 36 37 0a 00 00 00 00 00 00 00 00 00 GH4567.......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] slab_post_alloc_hook+0x8c/0x3c0 [] __kmem_cache_alloc_node+0x184/0x240 [] kmalloc_trace+0x2e/0xc0 [] test_fw_run_batch_request+0x9d/0x180 [] kthread+0x10b/0x140 [] ret_from_fork+0x29/0x50 unreferenced object 0xffff9553c334f000 (size 1024): comm "test_firmware-2", pid 5453, jiffies 4294944822 (age 65.652s) hex dump (first 32 bytes): 47 48 34 35 36 37 0a 00 00 00 00 00 00 00 00 00 GH4567.......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] slab_post_alloc_hook+0x8c/0x3c0 [] __kmem_cache_alloc_node+0x184/0x240 [] kmalloc_trace+0x2e/0xc0 [] test_fw_run_batch_request+0x9d/0x180 [] kthread+0x10b/0x140 [] ret_from_fork+0x29/0x50 unreferenced object 0xffff9553c3348400 (size 1024): comm "test_firmware-3", pid 5454, jiffies 4294944822 (age 65.652s) hex dump (first 32 bytes): 47 48 34 35 36 37 0a 00 00 00 00 00 00 00 00 00 GH4567.......... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] slab_post_alloc_hook+0x8c/0x3c0 [] __kmem_cache_alloc_node+0x184/0x240 [] kmalloc_trace+0x2e/0xc0 [] test_fw_run_batch_request+0x9d/0x180 [] kthread+0x10b/0x140 [] ret_from_fork+0x29/0x50 [root@pc-mtodorov firmware]# Note that the size 1024 corresponds to the size of the test firmware buffer. The actual number of the buffers leaked is around 70-110, depending on the test run. The cause of the leak is the following: request_partial_firmware_into_buf() and request_firmware_into_buf() provided firmware buffer isn't released on release_firmware(), we have allocated it and we are responsible for deallocating it manually. This is introduced in a number of context where previously only release_firmware() was called, which was insufficient. Reported-by: Mirsad Goran Todorovac Fixes: 7feebfa487b92 ("test_firmware: add support for request_firmware_into_buf") Cc: Greg Kroah-Hartman Cc: Dan Carpenter Cc: Takashi Iwai Cc: Luis Chamberlain Cc: Russ Weight Cc: Tianfei zhang Cc: Christophe JAILLET Cc: Zhengchao Shao Cc: Colin Ian King Cc: linux-kernel@vger.kernel.org Cc: Kees Cook Cc: Scott Branden Cc: Luis R. Rodriguez Cc: linux-kselftest@vger.kernel.org Cc: stable@vger.kernel.org # v5.4 Signed-off-by: Mirsad Goran Todorovac Link: https://lore.kernel.org/r/20230509084746.48259-3-mirsad.todorovac@alu.unizg.hr Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman --- lib/test_firmware.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) --- a/lib/test_firmware.c +++ b/lib/test_firmware.c @@ -44,6 +44,7 @@ struct test_batched_req { bool sent; const struct firmware *fw; const char *name; + const char *fw_buf; struct completion completion; struct task_struct *task; struct device *dev; @@ -174,8 +175,14 @@ static void __test_release_all_firmware( for (i = 0; i < test_fw_config->num_requests; i++) { req = &test_fw_config->reqs[i]; - if (req->fw) + if (req->fw) { + if (req->fw_buf) { + kfree_const(req->fw_buf); + req->fw_buf = NULL; + } release_firmware(req->fw); + req->fw = NULL; + } } vfree(test_fw_config->reqs); @@ -651,6 +658,8 @@ static ssize_t trigger_request_store(str mutex_lock(&test_fw_mutex); release_firmware(test_firmware); + if (test_fw_config->reqs) + __test_release_all_firmware(); test_firmware = NULL; rc = request_firmware(&test_firmware, name, dev); if (rc) { @@ -751,6 +760,8 @@ static ssize_t trigger_async_request_sto mutex_lock(&test_fw_mutex); release_firmware(test_firmware); test_firmware = NULL; + if (test_fw_config->reqs) + __test_release_all_firmware(); rc = request_firmware_nowait(THIS_MODULE, 1, name, dev, GFP_KERNEL, NULL, trigger_async_request_cb); if (rc) { @@ -793,6 +804,8 @@ static ssize_t trigger_custom_fallback_s mutex_lock(&test_fw_mutex); release_firmware(test_firmware); + if (test_fw_config->reqs) + __test_release_all_firmware(); test_firmware = NULL; rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOUEVENT, name, dev, GFP_KERNEL, NULL, @@ -855,6 +868,8 @@ static int test_fw_run_batch_request(voi test_fw_config->buf_size); if (!req->fw) kfree(test_buf); + else + req->fw_buf = test_buf; } else { req->rc = test_fw_config->req_firmware(&req->fw, req->name, @@ -915,6 +930,7 @@ static ssize_t trigger_batched_requests_ req->fw = NULL; req->idx = i; req->name = test_fw_config->name; + req->fw_buf = NULL; req->dev = dev; init_completion(&req->completion); req->task = kthread_run(test_fw_run_batch_request, req, @@ -1019,6 +1035,7 @@ ssize_t trigger_batched_requests_async_s for (i = 0; i < test_fw_config->num_requests; i++) { req = &test_fw_config->reqs[i]; req->name = test_fw_config->name; + req->fw_buf = NULL; req->fw = NULL; req->idx = i; init_completion(&req->completion);