{"id":2217754,"url":"http://patchwork.ozlabs.org/api/1.2/patches/2217754/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260330133035.287842-6-yebin@huaweicloud.com/","project":{"id":8,"url":"http://patchwork.ozlabs.org/api/1.2/projects/8/?format=json","name":"Linux ext4 filesystem development","link_name":"linux-ext4","list_id":"linux-ext4.vger.kernel.org","list_email":"linux-ext4@vger.kernel.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260330133035.287842-6-yebin@huaweicloud.com>","list_archive_url":null,"date":"2026-03-30T13:30:35","name":"[v5,5/5] ext4: fix possible null-ptr-deref in mbt_kunit_exit()","commit_ref":null,"pull_url":null,"state":"awaiting-upstream","archived":false,"hash":"dc5e86d89be8807faa1bf109d525cd030e4f7670","submitter":{"id":85089,"url":"http://patchwork.ozlabs.org/api/1.2/people/85089/?format=json","name":"Ye Bin","email":"yebin@huaweicloud.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/linux-ext4/patch/20260330133035.287842-6-yebin@huaweicloud.com/mbox/","series":[{"id":498033,"url":"http://patchwork.ozlabs.org/api/1.2/series/498033/?format=json","web_url":"http://patchwork.ozlabs.org/project/linux-ext4/list/?series=498033","date":"2026-03-30T13:30:32","name":"Fix some issues about ext4-test","version":5,"mbox":"http://patchwork.ozlabs.org/series/498033/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2217754/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2217754/checks/","tags":{},"related":[],"headers":{"Return-Path":"\n ","X-Original-To":["incoming@patchwork.ozlabs.org","linux-ext4@vger.kernel.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","patchwork-incoming@ozlabs.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=150.107.74.76; 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gandalf.ozlabs.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass (client-ip=172.105.105.114; helo=tor.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15533-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org","i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=huaweicloud.com;\n spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56"],"From":"Ye Bin ","To":"tytso@mit.edu,\n\tadilger.kernel@dilger.ca,\n\tlinux-ext4@vger.kernel.org","Cc":"jack@suse.cz","Subject":"[PATCH v5 5/5] ext4: fix possible null-ptr-deref in mbt_kunit_exit()","Date":"Mon, 30 Mar 2026 21:30:35 +0800","Message-Id":"<20260330133035.287842-6-yebin@huaweicloud.com>","X-Mailer":"git-send-email 2.34.1","In-Reply-To":"<20260330133035.287842-1-yebin@huaweicloud.com>","References":"<20260330133035.287842-1-yebin@huaweicloud.com>","Precedence":"bulk","X-Mailing-List":"linux-ext4@vger.kernel.org","List-Id":"","List-Subscribe":"","List-Unsubscribe":"","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","X-CM-TRANSID":"gCh0CgDHn0p7e8pp7U0sCw--.17260S9","X-Coremail-Antispam":"1UD129KBjvJXoW7ur4rXry3JF48Zw47Gr1UAwb_yoW8AFy8p3\n\t9xCFyUKrW8Wr1qyr47tryDAryIgws7uFyUJryxC3WavFZxAryrJFn5KFWYqFW8uFW8Xayr\n\tZ3WjvFyqg3WfAaUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUUvEb4IE77IF4wAFF20E14v26rWj6s0DM7CY07I20VC2zVCF04k2\n\t6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28IrcIa0xkI8VA2jI8067AKxVWUAV\n\tCq3wA2048vs2IY020Ec7CjxVAFwI0_Gr0_Xr1l8cAvFVAK0II2c7xJM28CjxkF64kEwVA0\n\trcxSw2x7M28EF7xvwVC0I7IYx2IY67AKxVWDJVCq3wA2z4x0Y4vE2Ix0cI8IcVCY1x0267\n\tAKxVW8Jr0_Cr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I0E\n\t14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40Ex7\n\txfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8JwAm72CE4IkC6x0Y\n\tz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7\n\tv_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF\n\t1VAY17CE14v26r126r1DMIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_JFI_Gr1lIx\n\tAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI\n\t42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWI\n\tevJa73UjIFyTuYvjxU2CJmUUUUU","X-CM-SenderInfo":"p1hex046kxt4xhlfz01xgou0bp/","X-Spam-Status":"No, score=-1.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDMARC_MISSING,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,\n\tSPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.1","X-Spam-Checker-Version":"SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org"},"content":"From: Ye Bin \n\nThere's issue as follows:\n # test_new_blocks_simple: failed to initialize: -12\nKASAN: null-ptr-deref in range [0x0000000000000638-0x000000000000063f]\nTainted: [E]=UNSIGNED_MODULE, [N]=TEST\nRIP: 0010:mbt_kunit_exit+0x5e/0x3e0 [ext4_test]\nCall Trace:\n \n kunit_try_run_case_cleanup+0xbc/0x100 [kunit]\n kunit_generic_run_threadfn_adapter+0x89/0x100 [kunit]\n kthread+0x408/0x540\n ret_from_fork+0xa76/0xdf0\n ret_from_fork_asm+0x1a/0x30\n\nIf mbt_kunit_init() init testcase failed will lead to null-ptr-deref.\nSo add test if 'sb' is inited success in mbt_kunit_exit().\n\nFixes: 7c9fa399a369 (\"ext4: add first unit test for ext4_mb_new_blocks_simple in mballoc\")\nSigned-off-by: Ye Bin \nReviewed-by: Ritesh Harjani (IBM) \nReviewed-by: Ojaswin Mujoo \n---\n fs/ext4/mballoc-test.c | 6 +++++-\n 1 file changed, 5 insertions(+), 1 deletion(-)","diff":"diff --git a/fs/ext4/mballoc-test.c b/fs/ext4/mballoc-test.c\nindex c75b91ae0cf0..90ed505fa4b1 100644\n--- a/fs/ext4/mballoc-test.c\n+++ b/fs/ext4/mballoc-test.c\n@@ -362,7 +362,6 @@ static int mbt_kunit_init(struct kunit *test)\n \t\treturn ret;\n \t}\n \n-\ttest->priv = sb;\n \tkunit_activate_static_stub(test,\n \t\t\t\t ext4_read_block_bitmap_nowait,\n \t\t\t\t ext4_read_block_bitmap_nowait_stub);\n@@ -383,6 +382,8 @@ static int mbt_kunit_init(struct kunit *test)\n \t\treturn -ENOMEM;\n \t}\n \n+\ttest->priv = sb;\n+\n \treturn 0;\n }\n \n@@ -390,6 +391,9 @@ static void mbt_kunit_exit(struct kunit *test)\n {\n \tstruct super_block *sb = (struct super_block *)test->priv;\n \n+\tif (!sb)\n+\t\treturn;\n+\n \tmbt_mb_release(sb);\n \tmbt_ctx_release(sb);\n \tmbt_ext4_free_super_block(sb);\n","prefixes":["v5","5/5"]}