CVE-2022-50457 (GCVE-0-2022-50457)
Vulnerability from cvelistv5
Published
2025-10-01 11:45
Modified
2025-10-01 11:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mtd: core: Fix refcount error in del_mtd_device() del_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which is mtd->dev.of_node. However, memset(&mtd->dev, 0) is called before of_node_put(). As the result, of_node_put() won't do anything in del_mtd_device(), and causes the refcount leak. del_mtd_device() memset(&mtd->dev, 0, sizeof(mtd->dev) # clear mtd->dev of_node_put() mtd_get_of_node(mtd) # mtd->dev is cleared, can't locate of_node # of_node_put(NULL) won't do anything Fix the error by caching the pointer of the device_node. OF: ERROR: memory leak, expected refcount 1 instead of 2, of_node_get()/of_node_put() unbalanced - destroy cset entry: attach overlay node /spi/spi-sram@0 CPU: 3 PID: 275 Comm: python3 Tainted: G N 6.1.0-rc3+ #54 0d8a1edddf51f172ff5226989a7565c6313b08e2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x67/0x83 kobject_get+0x155/0x160 of_node_get+0x1f/0x30 of_fwnode_get+0x43/0x70 fwnode_handle_get+0x54/0x80 fwnode_get_nth_parent+0xc9/0xe0 fwnode_full_name_string+0x3f/0xa0 device_node_string+0x30f/0x750 pointer+0x598/0x7a0 vsnprintf+0x62d/0x9b0 ... cfs_overlay_release+0x30/0x90 config_item_release+0xbe/0x1a0 config_item_put+0x5e/0x80 configfs_rmdir+0x3bd/0x540 vfs_rmdir+0x18c/0x320 do_rmdir+0x198/0x330 __x64_sys_rmdir+0x2c/0x40 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [<miquel.raynal@bootlin.com>: Light reword of the commit log]
References
Impacted products
Vendor Product Version
Linux Linux Version: 00596576a05145a1b5672897a82ef87af00becf4
Version: 00596576a05145a1b5672897a82ef87af00becf4
Version: 00596576a05145a1b5672897a82ef87af00becf4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdcore.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f6016557f1ef7735963bd8691592d2797bbf91d2",
              "status": "affected",
              "version": "00596576a05145a1b5672897a82ef87af00becf4",
              "versionType": "git"
            },
            {
              "lessThan": "616dc895d982026f41f500c88d1bfea004938cc8",
              "status": "affected",
              "version": "00596576a05145a1b5672897a82ef87af00becf4",
              "versionType": "git"
            },
            {
              "lessThan": "56570bdad5e31c5c538cd6efff5c4510256e1bb4",
              "status": "affected",
              "version": "00596576a05145a1b5672897a82ef87af00becf4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/mtd/mtdcore.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: core: Fix refcount error in del_mtd_device()\n\ndel_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which\nis mtd-\u003edev.of_node. However, memset(\u0026mtd-\u003edev, 0) is called before\nof_node_put(). As the result, of_node_put() won\u0027t do anything in\ndel_mtd_device(), and causes the refcount leak.\n\ndel_mtd_device()\n    memset(\u0026mtd-\u003edev, 0, sizeof(mtd-\u003edev) # clear mtd-\u003edev\n    of_node_put()\n        mtd_get_of_node(mtd) # mtd-\u003edev is cleared, can\u0027t locate of_node\n                             # of_node_put(NULL) won\u0027t do anything\n\nFix the error by caching the pointer of the device_node.\n\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\nof_node_get()/of_node_put() unbalanced - destroy cset entry: attach\noverlay node /spi/spi-sram@0\nCPU: 3 PID: 275 Comm: python3 Tainted: G N 6.1.0-rc3+ #54\n    0d8a1edddf51f172ff5226989a7565c6313b08e2\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\nrel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014\nCall Trace:\n\u003cTASK\u003e\n    dump_stack_lvl+0x67/0x83\n    kobject_get+0x155/0x160\n    of_node_get+0x1f/0x30\n    of_fwnode_get+0x43/0x70\n    fwnode_handle_get+0x54/0x80\n    fwnode_get_nth_parent+0xc9/0xe0\n    fwnode_full_name_string+0x3f/0xa0\n    device_node_string+0x30f/0x750\n    pointer+0x598/0x7a0\n    vsnprintf+0x62d/0x9b0\n    ...\n    cfs_overlay_release+0x30/0x90\n    config_item_release+0xbe/0x1a0\n    config_item_put+0x5e/0x80\n    configfs_rmdir+0x3bd/0x540\n    vfs_rmdir+0x18c/0x320\n    do_rmdir+0x198/0x330\n    __x64_sys_rmdir+0x2c/0x40\n    do_syscall_64+0x37/0x90\n    entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\n[\u003cmiquel.raynal@bootlin.com\u003e: Light reword of the commit log]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-10-01T11:45:30.263Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f6016557f1ef7735963bd8691592d2797bbf91d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/616dc895d982026f41f500c88d1bfea004938cc8"
        },
        {
          "url": "https://git.kernel.org/stable/c/56570bdad5e31c5c538cd6efff5c4510256e1bb4"
        }
      ],
      "title": "mtd: core: Fix refcount error in del_mtd_device()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50457",
    "datePublished": "2025-10-01T11:45:30.263Z",
    "dateReserved": "2025-10-01T11:38:45.640Z",
    "dateUpdated": "2025-10-01T11:45:30.263Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50457\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-10-01T12:15:38.967\",\"lastModified\":\"2025-10-02T19:12:17.160\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmtd: core: Fix refcount error in del_mtd_device()\\n\\ndel_mtd_device() will call of_node_put() to mtd_get_of_node(mtd), which\\nis mtd-\u003edev.of_node. However, memset(\u0026mtd-\u003edev, 0) is called before\\nof_node_put(). As the result, of_node_put() won\u0027t do anything in\\ndel_mtd_device(), and causes the refcount leak.\\n\\ndel_mtd_device()\\n    memset(\u0026mtd-\u003edev, 0, sizeof(mtd-\u003edev) # clear mtd-\u003edev\\n    of_node_put()\\n        mtd_get_of_node(mtd) # mtd-\u003edev is cleared, can\u0027t locate of_node\\n                             # of_node_put(NULL) won\u0027t do anything\\n\\nFix the error by caching the pointer of the device_node.\\n\\nOF: ERROR: memory leak, expected refcount 1 instead of 2,\\nof_node_get()/of_node_put() unbalanced - destroy cset entry: attach\\noverlay node /spi/spi-sram@0\\nCPU: 3 PID: 275 Comm: python3 Tainted: G N 6.1.0-rc3+ #54\\n    0d8a1edddf51f172ff5226989a7565c6313b08e2\\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\nrel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014\\nCall Trace:\\n\u003cTASK\u003e\\n    dump_stack_lvl+0x67/0x83\\n    kobject_get+0x155/0x160\\n    of_node_get+0x1f/0x30\\n    of_fwnode_get+0x43/0x70\\n    fwnode_handle_get+0x54/0x80\\n    fwnode_get_nth_parent+0xc9/0xe0\\n    fwnode_full_name_string+0x3f/0xa0\\n    device_node_string+0x30f/0x750\\n    pointer+0x598/0x7a0\\n    vsnprintf+0x62d/0x9b0\\n    ...\\n    cfs_overlay_release+0x30/0x90\\n    config_item_release+0xbe/0x1a0\\n    config_item_put+0x5e/0x80\\n    configfs_rmdir+0x3bd/0x540\\n    vfs_rmdir+0x18c/0x320\\n    do_rmdir+0x198/0x330\\n    __x64_sys_rmdir+0x2c/0x40\\n    do_syscall_64+0x37/0x90\\n    entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n\\n[\u003cmiquel.raynal@bootlin.com\u003e: Light reword of the commit log]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/56570bdad5e31c5c538cd6efff5c4510256e1bb4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/616dc895d982026f41f500c88d1bfea004938cc8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f6016557f1ef7735963bd8691592d2797bbf91d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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