ghsa-j49h-xgx7-8459
Vulnerability from github
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: 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]
{
"affected": [],
"aliases": [
"CVE-2022-50457"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-10-01T12:15:38Z",
"severity": null
},
"details": "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]",
"id": "GHSA-j49h-xgx7-8459",
"modified": "2025-10-01T12:30:28Z",
"published": "2025-10-01T12:30:28Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50457"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/56570bdad5e31c5c538cd6efff5c4510256e1bb4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/616dc895d982026f41f500c88d1bfea004938cc8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f6016557f1ef7735963bd8691592d2797bbf91d2"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.