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{ "id": 2225655, "url": "http://patchwork.ozlabs.org/api/covers/2225655/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260421113416.4040274-1-yangerkun@huawei.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/projects/8/?format=api", "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": "<20260421113416.4040274-1-yangerkun@huawei.com>", "list_archive_url": null, "date": "2026-04-21T11:34:13", "name": "[PATH,6.6,0/3] fix potential ext4 null pointer", "submitter": { "id": 75707, "url": "http://patchwork.ozlabs.org/api/people/75707/?format=api", "name": "Yang Erkun", "email": "yangerkun@huawei.com" }, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/cover/20260421113416.4040274-1-yangerkun@huawei.com/mbox/", "series": [ { "id": 500784, "url": "http://patchwork.ozlabs.org/api/series/500784/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=500784", "date": "2026-04-21T11:34:14", "name": "fix potential ext4 null pointer", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500784/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/covers/2225655/comments/", "headers": { "Return-Path": "\n <SRS0=I1hh=CU=vger.kernel.org=linux-ext4+bounces-15951-patchwork-incoming=ozlabs.org@ozlabs.org>", "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=2404:9400:2221:ea00::3; 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gandalf.ozlabs.org;\n dmarc=fail (p=quarantine dis=none) header.from=huawei.com;\n spf=pass (client-ip=2600:3c15:e001:75::12fc:5321; helo=sin.lore.kernel.org;\n envelope-from=linux-ext4+bounces-15951-patchwork-incoming=ozlabs.org@vger.kernel.org;\n receiver=ozlabs.org) smtp.mailfrom=vger.kernel.org", "i=1; smtp.subspace.kernel.org;\n dmarc=fail (p=quarantine dis=none) header.from=huawei.com;\n spf=pass smtp.mailfrom=huaweicloud.com; arc=none smtp.client-ip=45.249.212.56" ], "From": "Yang Erkun <yangerkun@huawei.com>", "To": "stable@kernel.org,\n\tlinux-ext4@vger.kernel.org", "Cc": "tytso@mit.edu,\n\tlibaokun@linux.alibaba.com,\n\tadilger.kernel@dilger.ca,\n\tojaswin@linux.ibm.com,\n\tritesh.list@gmail.com,\n\tjack@suse.cz,\n\tgregkh@linuxfoundation.org,\n\tsashal@kernel.org,\n\tyangerkun@huawei.com,\n\tyi.zhang@huawei.com,\n\tzhangxiaoxu5@huawei.com", "Subject": "[PATH 6.6 0/3] fix potential ext4 null pointer", "Date": "Tue, 21 Apr 2026 19:34:13 +0800", "Message-Id": "<20260421113416.4040274-1-yangerkun@huawei.com>", "X-Mailer": "git-send-email 2.39.2", "Precedence": "bulk", "X-Mailing-List": "linux-ext4@vger.kernel.org", "List-Id": "<linux-ext4.vger.kernel.org>", "List-Subscribe": "<mailto:linux-ext4+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-ext4+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-CM-TRANSID": "_Ch0CgAHtL21Y+dp_aHLBA--.55420S4", "X-Coremail-Antispam": "1UD129KBjvJXoWxZF4UGr43GF13XryfCF4DArb_yoWrKrWkpF\n\t1akF4UGr4vqr9xJF47Aw15Jr13Cr4kAa1UW3W7Wr48t3WUu3W5Xr1UJrWjyFZrXr1UWFW3\n\ttr1DXw4IkrnrAaUanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2\n\t9KBjDU0xBIdaVrnRJUUU9mb4IE77IF4wAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k2\n\t6cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4\n\tvEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Ar0_tr1l84ACjcxK6xIIjxv20xvEc7Cj\n\txVAFwI0_Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I8E87Iv6xkF7I\n\t0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI64kE6c02F40E\n\tx7xfMcIj6xIIjxv20xvE14v26r1Y6r17McIj6I8E87Iv67AKxVW8Jr0_Cr1UMcvjeVCFs4\n\tIE7xkEbVWUJVW8JwACjcxG0xvY0x0EwIxGrwACI402YVCY1x02628vn2kIc2xKxwCY1x02\n\t62kKe7AKxVWUtVW8ZwCF04k20xvY0x0EwIxGrwCF04k20xvEw4C26cxK6c8Ij28IcwCFx2\n\tIqxVCFs4IE7xkEbVWUJVW8JwC20s026c02F40E14v26r1j6r18MI8I3I0E7480Y4vE14v2\n\t6r106r1rMI8E67AF67kF1VAFwI0_Jw0_GFylIxkGc2Ij64vIr41lIxAIcVC0I7IYx2IY67\n\tAKxVWUJVWUCwCI42IY6xIIjxv20xvEc7CjxVAFwI0_Gr0_Cr1lIxAIcVCF04k26cxKx2IY\n\ts7xG6r1j6r1xMIIF0xvEx4A2jsIE14v26r1j6r4UMIIF0xvEx4A2jsIEc7CjxVAFwI0_Gr\n\t0_Gr1UYxBIdaVFxhVjvjDU0xZFpf9x07ULAwxUUUUU=", "Sender": "yangerkun@huaweicloud.com", "X-CM-SenderInfo": "51dqwvhunx0q5kxd4v5lfo033gof0z/", "X-Spam-Status": "No, score=0.1 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDMARC_QUAR,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": "Our Hulk robot discovered that there were missing 6b854d552711\n(\"ext4: get rid of ppath in get_ext_path()\") when backporting the\nlinux-6.6.y mainline patch set[1], which could potentially trigger\nsome error branches in ext4 to cause a panic. I also verified this\npoint during testing using xfstests-bld[2]. Along with this, we\nhave also backported other related patches from the corresponding\npatch set [1].\n\n[1]. https://lore.kernel.org/all/20240822023545.1994557-1-libaokun@huaweicloud.com/\n[2]. https://github.com/tytso/xfstests-bld\n\ngeneric/051 81s ... [09:20:24][ 509.012535] run fstests generic/051 at 2026-04-21 09:20:24\n[ 509.314026] EXT4-fs (vdb): mounted filesystem d225342d-c437-4a7d-893b-5d02903a5ea4 r/w with ordered data mode. Quota mode: none.\n[ 509.397019] EXT4-fs (vdc): mounted filesystem 72b9e6ee-4b56-45ee-b71e-ca491d2fd7e9 r/w with ordered data mode. Quota mode: none.\n[ 509.399614] EXT4-fs (vdc): shut down requested (1)\n[ 509.400082] Aborting journal on device vdc-8.\n[ 509.402378] EXT4-fs (vdc): unmounting filesystem 72b9e6ee-4b56-45ee-b71e-ca491d2fd7e9.\n[ 509.443140] EXT4-fs (vdc): mounted filesystem 03f15f3c-5938-41ea-bbf8-321de40d01ff r/w with ordered data mode. Quota mode: none.\n[ 539.831842] EXT4-fs (vdc): unmounting filesystem 03f15f3c-5938-41ea-bbf8-321de40d01ff.\n[ 539.868710] EXT4-fs (vdc): mounted filesystem 03f15f3c-5938-41ea-bbf8-321de40d01ff r/w with ordered data mode. Quota mode: none.\n[ 552.967466] BUG: unable to handle page fault for address: ffffffffffffffec\n[ 552.968455] #PF: supervisor read access in kernel mode\n[ 552.969157] #PF: error_code(0x0000) - not-present page\n[ 552.969859] PGD 282c067 P4D 282d067 PUD 282f067 PMD 0\n[ 552.970575] Oops: 0000 [#1] PREEMPT SMP NOPTI\n[ 552.971179] CPU: 0 PID: 292843 Comm: fsstress Not tainted 6.6.135-xfstests #2\n[ 552.972143] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.1-2.fc37 04/01/2014\n[ 552.973284] RIP: 0010:ext4_ext_map_blocks+0x191/0xab0\n[ 552.973986] Code: 4c 89 e6 48 89 ef 48 8d 54 24 60 e8 89 6c ff ff 85 c0 89 44 24 28 0f 84 59 02 00 00 48 8b 44 24 30 48 85 c0 0f 84 09 06 00 00 <44> 0f b7 78 08 45 31 f6 48 89 1c 24 49 89 c4 44 89 f3 49 89 c6 49\n[ 552.976362] RSP: 0018:ffa0000006ab3c78 EFLAGS: 00010286\n[ 552.976862] RAX: ffffffffffffffe4 RBX: ffa0000006ab3de0 RCX: 0000000000000000\n[ 552.977525] RDX: ffffffff82244590 RSI: ffffffff825d3cfc RDI: ff1100002e5d5068\n[ 552.978189] RBP: ff110000064f6628 R08: ffffffff825d3ddd R09: ff1100006b74a618\n[ 552.978850] R10: 00000000d8f693c7 R11: ff11000077f49ff0 R12: ff110000062040c0\n[ 552.979511] R13: 0000000000000043 R14: 0000000000025b80 R15: ff110000069f1000\n[ 552.980159] FS: 00007f7685ec8740(0000) GS:ff1100007dc00000(0000) knlGS:0000000000000000\n[ 552.980906] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[ 552.981445] CR2: ffffffffffffffec CR3: 0000000006a44005 CR4: 0000000000771ef0\n[ 552.982091] PKRU: 55555554\n[ 552.982351] Call Trace:\n[ 552.982606] <TASK>\n[ 552.982818] ext4_map_blocks+0x23e/0x6b0\n[ 552.983191] ext4_alloc_file_blocks.isra.0+0x12b/0x370\n[ 552.983671] ext4_fallocate+0x150/0x310\n[ 552.984034] vfs_fallocate+0x13e/0x380\n[ 552.984391] ioctl_preallocate+0xa4/0xd0\n[ 552.984769] __x64_sys_ioctl+0x71/0xd0\n[ 552.985126] do_syscall_64+0x38/0x80\n[ 552.985479] entry_SYSCALL_64_after_hwframe+0x78/0xe2\n[ 552.985956] RIP: 0033:0x7f7685fc8c5b\n[ 552.986291] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00\n[ 552.987925] RSP: 002b:00007fff16838290 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n[ 552.988571] RAX: ffffffffffffffda RBX: 000000000000991b RCX: 00007f7685fc8c5b\n[ 552.989186] RDX: 00007fff16838310 RSI: 000000004030582a RDI: 0000000000000003\n[ 552.989812] RBP: 0000000000000003 R08: 0000000000000002 R09: 00007fff168382fc\n[ 552.990428] R10: 0000000000001000 R11: 0000000000000246 R12: 0000000000000000\n[ 552.991043] R13: 00000000001a6829 R14: 8f5c28f5c28f5c29 R15: 000055c9bd970650\n[ 552.991655] </TASK>\n[ 552.991857] CR2: ffffffffffffffec\n[ 552.992154] ---[ end trace 0000000000000000 ]---\n[ 552.992557] RIP: 0010:ext4_ext_map_blocks+0x191/0xab0\n\nBaokun Li (3):\n ext4: get rid of ppath in get_ext_path()\n ext4: get rid of ppath in ext4_force_split_extent_at()\n ext4: get rid of ppath in convert_initialized_extent()\n\n fs/ext4/extents.c | 111 +++++++++++++++++++++++-------------------\n fs/ext4/move_extent.c | 34 ++++++-------\n 2 files changed, 77 insertions(+), 68 deletions(-)" }