CVE-2022-50067 (GCVE-0-2022-50067)
Vulnerability from cvelistv5
Published
2025-06-18 11:02
Modified
2025-06-18 11:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: unset reloc control if transaction commit fails in prepare_to_relocate() In btrfs_relocate_block_group(), the rc is allocated. Then btrfs_relocate_block_group() calls relocate_block_group() prepare_to_relocate() set_reloc_control() that assigns rc to the variable fs_info->reloc_ctl. When prepare_to_relocate() returns, it calls btrfs_commit_transaction() btrfs_start_dirty_block_groups() btrfs_alloc_path() kmem_cache_zalloc() which may fail for example (or other errors could happen). When the failure occurs, btrfs_relocate_block_group() detects the error and frees rc and doesn't set fs_info->reloc_ctl to NULL. After that, in btrfs_init_reloc_root(), rc is retrieved from fs_info->reloc_ctl and then used, which may cause a use-after-free bug. This possible bug can be triggered by calling btrfs_ioctl_balance() before calling btrfs_ioctl_defrag(). To fix this possible bug, in prepare_to_relocate(), check if btrfs_commit_transaction() fails. If the failure occurs, unset_reloc_control() is called to set fs_info->reloc_ctl to NULL. The error log in our fault-injection testing is shown as follows: [ 58.751070] BUG: KASAN: use-after-free in btrfs_init_reloc_root+0x7ca/0x920 [btrfs] ... [ 58.753577] Call Trace: ... [ 58.755800] kasan_report+0x45/0x60 [ 58.756066] btrfs_init_reloc_root+0x7ca/0x920 [btrfs] [ 58.757304] record_root_in_trans+0x792/0xa10 [btrfs] [ 58.757748] btrfs_record_root_in_trans+0x463/0x4f0 [btrfs] [ 58.758231] start_transaction+0x896/0x2950 [btrfs] [ 58.758661] btrfs_defrag_root+0x250/0xc00 [btrfs] [ 58.759083] btrfs_ioctl_defrag+0x467/0xa00 [btrfs] [ 58.759513] btrfs_ioctl+0x3c95/0x114e0 [btrfs] ... [ 58.768510] Allocated by task 23683: [ 58.768777] ____kasan_kmalloc+0xb5/0xf0 [ 58.769069] __kmalloc+0x227/0x3d0 [ 58.769325] alloc_reloc_control+0x10a/0x3d0 [btrfs] [ 58.769755] btrfs_relocate_block_group+0x7aa/0x1e20 [btrfs] [ 58.770228] btrfs_relocate_chunk+0xf1/0x760 [btrfs] [ 58.770655] __btrfs_balance+0x1326/0x1f10 [btrfs] [ 58.771071] btrfs_balance+0x3150/0x3d30 [btrfs] [ 58.771472] btrfs_ioctl_balance+0xd84/0x1410 [btrfs] [ 58.771902] btrfs_ioctl+0x4caa/0x114e0 [btrfs] ... [ 58.773337] Freed by task 23683: ... [ 58.774815] kfree+0xda/0x2b0 [ 58.775038] free_reloc_control+0x1d6/0x220 [btrfs] [ 58.775465] btrfs_relocate_block_group+0x115c/0x1e20 [btrfs] [ 58.775944] btrfs_relocate_chunk+0xf1/0x760 [btrfs] [ 58.776369] __btrfs_balance+0x1326/0x1f10 [btrfs] [ 58.776784] btrfs_balance+0x3150/0x3d30 [btrfs] [ 58.777185] btrfs_ioctl_balance+0xd84/0x1410 [btrfs] [ 58.777621] btrfs_ioctl+0x4caa/0x114e0 [btrfs] ...
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/relocation.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ff0e8ed8dfb584575cffc1561f17a1d094e8565b",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "dcb11fe0a0a9cca2b7425191b9bf30dc29f2ad0f",
              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "78f8c2370e3d33e35f23bdc648653d779aeacb6e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "5d741afed0bac206640cc64d77b97853283cf719",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "85f02d6c856b9f3a0acf5219de6e32f58b9778eb",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/btrfs/relocation.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "4.14.*",
              "status": "unaffected",
              "version": "4.14.318",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "4.19.*",
              "status": "unaffected",
              "version": "4.19.286",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.247",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.184",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.63",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.19.*",
              "status": "unaffected",
              "version": "5.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.14.318",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.19.286",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.247",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.184",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.63",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: unset reloc control if transaction commit fails in prepare_to_relocate()\n\nIn btrfs_relocate_block_group(), the rc is allocated.  Then\nbtrfs_relocate_block_group() calls\n\nrelocate_block_group()\n  prepare_to_relocate()\n    set_reloc_control()\n\nthat assigns rc to the variable fs_info-\u003ereloc_ctl. When\nprepare_to_relocate() returns, it calls\n\nbtrfs_commit_transaction()\n  btrfs_start_dirty_block_groups()\n    btrfs_alloc_path()\n      kmem_cache_zalloc()\n\nwhich may fail for example (or other errors could happen). When the\nfailure occurs, btrfs_relocate_block_group() detects the error and frees\nrc and doesn\u0027t set fs_info-\u003ereloc_ctl to NULL. After that, in\nbtrfs_init_reloc_root(), rc is retrieved from fs_info-\u003ereloc_ctl and\nthen used, which may cause a use-after-free bug.\n\nThis possible bug can be triggered by calling btrfs_ioctl_balance()\nbefore calling btrfs_ioctl_defrag().\n\nTo fix this possible bug, in prepare_to_relocate(), check if\nbtrfs_commit_transaction() fails. If the failure occurs,\nunset_reloc_control() is called to set fs_info-\u003ereloc_ctl to NULL.\n\nThe error log in our fault-injection testing is shown as follows:\n\n  [   58.751070] BUG: KASAN: use-after-free in btrfs_init_reloc_root+0x7ca/0x920 [btrfs]\n  ...\n  [   58.753577] Call Trace:\n  ...\n  [   58.755800]  kasan_report+0x45/0x60\n  [   58.756066]  btrfs_init_reloc_root+0x7ca/0x920 [btrfs]\n  [   58.757304]  record_root_in_trans+0x792/0xa10 [btrfs]\n  [   58.757748]  btrfs_record_root_in_trans+0x463/0x4f0 [btrfs]\n  [   58.758231]  start_transaction+0x896/0x2950 [btrfs]\n  [   58.758661]  btrfs_defrag_root+0x250/0xc00 [btrfs]\n  [   58.759083]  btrfs_ioctl_defrag+0x467/0xa00 [btrfs]\n  [   58.759513]  btrfs_ioctl+0x3c95/0x114e0 [btrfs]\n  ...\n  [   58.768510] Allocated by task 23683:\n  [   58.768777]  ____kasan_kmalloc+0xb5/0xf0\n  [   58.769069]  __kmalloc+0x227/0x3d0\n  [   58.769325]  alloc_reloc_control+0x10a/0x3d0 [btrfs]\n  [   58.769755]  btrfs_relocate_block_group+0x7aa/0x1e20 [btrfs]\n  [   58.770228]  btrfs_relocate_chunk+0xf1/0x760 [btrfs]\n  [   58.770655]  __btrfs_balance+0x1326/0x1f10 [btrfs]\n  [   58.771071]  btrfs_balance+0x3150/0x3d30 [btrfs]\n  [   58.771472]  btrfs_ioctl_balance+0xd84/0x1410 [btrfs]\n  [   58.771902]  btrfs_ioctl+0x4caa/0x114e0 [btrfs]\n  ...\n  [   58.773337] Freed by task 23683:\n  ...\n  [   58.774815]  kfree+0xda/0x2b0\n  [   58.775038]  free_reloc_control+0x1d6/0x220 [btrfs]\n  [   58.775465]  btrfs_relocate_block_group+0x115c/0x1e20 [btrfs]\n  [   58.775944]  btrfs_relocate_chunk+0xf1/0x760 [btrfs]\n  [   58.776369]  __btrfs_balance+0x1326/0x1f10 [btrfs]\n  [   58.776784]  btrfs_balance+0x3150/0x3d30 [btrfs]\n  [   58.777185]  btrfs_ioctl_balance+0xd84/0x1410 [btrfs]\n  [   58.777621]  btrfs_ioctl+0x4caa/0x114e0 [btrfs]\n  ..."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:02:13.127Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ff0e8ed8dfb584575cffc1561f17a1d094e8565b"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcb11fe0a0a9cca2b7425191b9bf30dc29f2ad0f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e546674031fc1576da501e27a8fd165222e5a37"
        },
        {
          "url": "https://git.kernel.org/stable/c/b60e862e133f646f19023ece1d476d630a660de1"
        },
        {
          "url": "https://git.kernel.org/stable/c/78f8c2370e3d33e35f23bdc648653d779aeacb6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d741afed0bac206640cc64d77b97853283cf719"
        },
        {
          "url": "https://git.kernel.org/stable/c/85f02d6c856b9f3a0acf5219de6e32f58b9778eb"
        }
      ],
      "title": "btrfs: unset reloc control if transaction commit fails in prepare_to_relocate()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50067",
    "datePublished": "2025-06-18T11:02:13.127Z",
    "dateReserved": "2025-06-18T10:57:27.405Z",
    "dateUpdated": "2025-06-18T11:02:13.127Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50067\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:35.490\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbtrfs: unset reloc control if transaction commit fails in prepare_to_relocate()\\n\\nIn btrfs_relocate_block_group(), the rc is allocated.  Then\\nbtrfs_relocate_block_group() calls\\n\\nrelocate_block_group()\\n  prepare_to_relocate()\\n    set_reloc_control()\\n\\nthat assigns rc to the variable fs_info-\u003ereloc_ctl. When\\nprepare_to_relocate() returns, it calls\\n\\nbtrfs_commit_transaction()\\n  btrfs_start_dirty_block_groups()\\n    btrfs_alloc_path()\\n      kmem_cache_zalloc()\\n\\nwhich may fail for example (or other errors could happen). When the\\nfailure occurs, btrfs_relocate_block_group() detects the error and frees\\nrc and doesn\u0027t set fs_info-\u003ereloc_ctl to NULL. After that, in\\nbtrfs_init_reloc_root(), rc is retrieved from fs_info-\u003ereloc_ctl and\\nthen used, which may cause a use-after-free bug.\\n\\nThis possible bug can be triggered by calling btrfs_ioctl_balance()\\nbefore calling btrfs_ioctl_defrag().\\n\\nTo fix this possible bug, in prepare_to_relocate(), check if\\nbtrfs_commit_transaction() fails. If the failure occurs,\\nunset_reloc_control() is called to set fs_info-\u003ereloc_ctl to NULL.\\n\\nThe error log in our fault-injection testing is shown as follows:\\n\\n  [   58.751070] BUG: KASAN: use-after-free in btrfs_init_reloc_root+0x7ca/0x920 [btrfs]\\n  ...\\n  [   58.753577] Call Trace:\\n  ...\\n  [   58.755800]  kasan_report+0x45/0x60\\n  [   58.756066]  btrfs_init_reloc_root+0x7ca/0x920 [btrfs]\\n  [   58.757304]  record_root_in_trans+0x792/0xa10 [btrfs]\\n  [   58.757748]  btrfs_record_root_in_trans+0x463/0x4f0 [btrfs]\\n  [   58.758231]  start_transaction+0x896/0x2950 [btrfs]\\n  [   58.758661]  btrfs_defrag_root+0x250/0xc00 [btrfs]\\n  [   58.759083]  btrfs_ioctl_defrag+0x467/0xa00 [btrfs]\\n  [   58.759513]  btrfs_ioctl+0x3c95/0x114e0 [btrfs]\\n  ...\\n  [   58.768510] Allocated by task 23683:\\n  [   58.768777]  ____kasan_kmalloc+0xb5/0xf0\\n  [   58.769069]  __kmalloc+0x227/0x3d0\\n  [   58.769325]  alloc_reloc_control+0x10a/0x3d0 [btrfs]\\n  [   58.769755]  btrfs_relocate_block_group+0x7aa/0x1e20 [btrfs]\\n  [   58.770228]  btrfs_relocate_chunk+0xf1/0x760 [btrfs]\\n  [   58.770655]  __btrfs_balance+0x1326/0x1f10 [btrfs]\\n  [   58.771071]  btrfs_balance+0x3150/0x3d30 [btrfs]\\n  [   58.771472]  btrfs_ioctl_balance+0xd84/0x1410 [btrfs]\\n  [   58.771902]  btrfs_ioctl+0x4caa/0x114e0 [btrfs]\\n  ...\\n  [   58.773337] Freed by task 23683:\\n  ...\\n  [   58.774815]  kfree+0xda/0x2b0\\n  [   58.775038]  free_reloc_control+0x1d6/0x220 [btrfs]\\n  [   58.775465]  btrfs_relocate_block_group+0x115c/0x1e20 [btrfs]\\n  [   58.775944]  btrfs_relocate_chunk+0xf1/0x760 [btrfs]\\n  [   58.776369]  __btrfs_balance+0x1326/0x1f10 [btrfs]\\n  [   58.776784]  btrfs_balance+0x3150/0x3d30 [btrfs]\\n  [   58.777185]  btrfs_ioctl_balance+0xd84/0x1410 [btrfs]\\n  [   58.777621]  btrfs_ioctl+0x4caa/0x114e0 [btrfs]\\n  ...\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: anular el control de reubicaci\u00f3n si falla el commit de la transacci\u00f3n en prepare_to_relocate(). En btrfs_relocate_block_group(), se asigna el rc. Luego, btrfs_relocate_block_group() llama a relocate_block_group() prepare_to_relocate() set_reloc_control() que asigna rc a la variable fs_info-\u0026gt;reloc_ctl. Cuando prepare_to_relocate() retorna, llama a btrfs_commit_transaction() btrfs_start_dirty_block_groups() btrfs_alloc_path() kmem_cache_zalloc() que puede fallar, por ejemplo (o podr\u00edan ocurrir otros errores). Cuando ocurre el fallo, btrfs_relocate_block_group() detecta el error y libera rc y no establece fs_info-\u0026gt;reloc_ctl en NULL. Posteriormente, en btrfs_init_reloc_root(), se recupera rc de fs_info-\u0026gt;reloc_ctl y se utiliza, lo que podr\u00eda causar un error de Use-After-Free. Este posible error se puede activar llamando a btrfs_ioctl_balance() antes de llamar a btrfs_ioctl_defrag(). Para corregir este posible error, en prepare_to_relocate(), compruebe si btrfs_commit_transaction() falla. Si falla, se llama a unset_reloc_control() para establecer fs_info-\u0026gt;reloc_ctl en NULL. El registro de errores en nuestras pruebas de inyecci\u00f3n de fallas se muestra a continuaci\u00f3n: [ 58.751070] ERROR: KASAN: use-after-free en btrfs_init_reloc_root+0x7ca/0x920 [btrfs] ... [ 58.753577] Seguimiento de llamadas: ... [ 58.755800] kasan_report+0x45/0x60 [ 58.756066] btrfs_init_reloc_root+0x7ca/0x920 [btrfs] [ 58.757304] record_root_in_trans+0x792/0xa10 [btrfs] [ 58.757748] btrfs_record_root_in_trans+0x463/0x4f0 [btrfs] [ 58.758231] start_transaction+0x896/0x2950 [btrfs] [ 58.758661] btrfs_defrag_root+0x250/0xc00 [btrfs] [ 58.759083] btrfs_ioctl_defrag+0x467/0xa00 [btrfs] [ 58.759513] btrfs_ioctl+0x3c95/0x114e0 [btrfs] ... [ 58.768510] Asignado por la tarea 23683: [ 58.768777] ____kasan_kmalloc+0xb5/0xf0 [ 58.769069] __kmalloc+0x227/0x3d0 [ 58.769325] alloc_reloc_control+0x10a/0x3d0 [btrfs] [ 58.769755] btrfs_relocate_block_group+0x7aa/0x1e20 [btrfs] [ 58.770228] btrfs_relocate_chunk+0xf1/0x760 [btrfs] [ 58.770655] __btrfs_balance+0x1326/0x1f10 [btrfs] [ 58.771071] btrfs_balance+0x3150/0x3d30 [btrfs] [ 58.771472] btrfs_ioctl_balance+0xd84/0x1410 [btrfs] [ 58.771902] btrfs_ioctl+0x4caa/0x114e0 [btrfs] ... [ 58.773337] Liberado por la tarea 23683: ... [ 58.774815] kfree+0xda/0x2b0 [ 58.775038] free_reloc_control+0x1d6/0x220 [btrfs] [ 58.775465] btrfs_relocate_block_group+0x115c/0x1e20 [btrfs] [ 58.775944] btrfs_relocate_chunk+0xf1/0x760 [btrfs] [ 58.776369] __btrfs_balance+0x1326/0x1f10 [btrfs] [ 58.776784] btrfs_balance+0x3150/0x3d30 [btrfs] [ 58.777185] btrfs_ioctl_balance+0xd84/0x1410 [btrfs] [ 58.777621] btrfs_ioctl+0x4caa/0x114e0 [btrfs] ...\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5d741afed0bac206640cc64d77b97853283cf719\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78f8c2370e3d33e35f23bdc648653d779aeacb6e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/85f02d6c856b9f3a0acf5219de6e32f58b9778eb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e546674031fc1576da501e27a8fd165222e5a37\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b60e862e133f646f19023ece1d476d630a660de1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dcb11fe0a0a9cca2b7425191b9bf30dc29f2ad0f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ff0e8ed8dfb584575cffc1561f17a1d094e8565b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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