From mboxrd@z Thu Jan 1 00:00:00 1970 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 D1F5ECE79D0 for ; Wed, 20 Sep 2023 12:12:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235402AbjITMMs (ORCPT ); Wed, 20 Sep 2023 08:12:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60266 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235445AbjITMMq (ORCPT ); Wed, 20 Sep 2023 08:12:46 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02244E8 for ; Wed, 20 Sep 2023 05:12:38 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 34852C433C8; Wed, 20 Sep 2023 12:12:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1695211958; bh=SMul6QYJudpChO4/N1cd6fCnZHtm7dgXAZuiV/YXwJg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fAY9KxoMzHA+GPmJcKUfA1BE1rrFzvJ+pNDxGJsQkRAqSKminKqaAp7I8dqhBkVLP KsGwhgmGVUom6dm9hykZc/RU+F9PFzXmz06BPCfnVMHnN3S20nBYYGnWFffYYLFIlB ZZKjwhPD6tN+OnI6+5EDemjYSWdAg8oHcl0COLcY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ruan Jinjie , Rob Herring , Sasha Levin Subject: [PATCH 4.19 099/273] of: unittest: fix null pointer dereferencing in of_unittest_find_node_by_name() Date: Wed, 20 Sep 2023 13:28:59 +0200 Message-ID: <20230920112849.503682059@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20230920112846.440597133@linuxfoundation.org> References: <20230920112846.440597133@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ruan Jinjie [ Upstream commit d6ce4f0ea19c32f10867ed93d8386924326ab474 ] when kmalloc() fail to allocate memory in kasprintf(), name or full_name will be NULL, strcmp() will cause null pointer dereference. Fixes: 0d638a07d3a1 ("of: Convert to using %pOF instead of full_name") Signed-off-by: Ruan Jinjie Link: https://lore.kernel.org/r/20230727080246.519539-1-ruanjinjie@huawei.com Signed-off-by: Rob Herring Signed-off-by: Sasha Levin --- drivers/of/unittest.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c index 29f17c3449aa4..59dc68a1d8ff3 100644 --- a/drivers/of/unittest.c +++ b/drivers/of/unittest.c @@ -52,7 +52,7 @@ static void __init of_unittest_find_node_by_name(void) np = of_find_node_by_path("/testcase-data"); name = kasprintf(GFP_KERNEL, "%pOF", np); - unittest(np && !strcmp("/testcase-data", name), + unittest(np && name && !strcmp("/testcase-data", name), "find /testcase-data failed\n"); of_node_put(np); kfree(name); @@ -63,14 +63,14 @@ static void __init of_unittest_find_node_by_name(void) np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a"); name = kasprintf(GFP_KERNEL, "%pOF", np); - unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name), + unittest(np && name && !strcmp("/testcase-data/phandle-tests/consumer-a", name), "find /testcase-data/phandle-tests/consumer-a failed\n"); of_node_put(np); kfree(name); np = of_find_node_by_path("testcase-alias"); name = kasprintf(GFP_KERNEL, "%pOF", np); - unittest(np && !strcmp("/testcase-data", name), + unittest(np && name && !strcmp("/testcase-data", name), "find testcase-alias failed\n"); of_node_put(np); kfree(name); @@ -81,7 +81,7 @@ static void __init of_unittest_find_node_by_name(void) np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a"); name = kasprintf(GFP_KERNEL, "%pOF", np); - unittest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", name), + unittest(np && name && !strcmp("/testcase-data/phandle-tests/consumer-a", name), "find testcase-alias/phandle-tests/consumer-a failed\n"); of_node_put(np); kfree(name); @@ -1138,6 +1138,8 @@ static void attach_node_and_children(struct device_node *np) const char *full_name; full_name = kasprintf(GFP_KERNEL, "%pOF", np); + if (!full_name) + return; if (!strcmp(full_name, "/__local_fixups__") || !strcmp(full_name, "/__fixups__")) { -- 2.40.1