{"id":"CVE-2022-50457","summary":"mtd: core: Fix refcount error in del_mtd_device()","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(&mtd-\u003edev, 0) is called before\nof_node_put(). As the result, of_node_put() won't do anything in\ndel_mtd_device(), and causes the refcount leak.\n\ndel_mtd_device()\n    memset(&mtd-\u003edev, 0, sizeof(mtd-\u003edev) # clear mtd-\u003edev\n    of_node_put()\n        mtd_get_of_node(mtd) # mtd-\u003edev is cleared, can't locate of_node\n                             # of_node_put(NULL) won't 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]","modified":"2026-04-02T08:28:31.337781Z","published":"2025-10-01T11:45:30.263Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50457.json","cna_assigner":"Linux"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50457.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50457"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"00596576a05145a1b5672897a82ef87af00becf4"},{"fixed":"f6016557f1ef7735963bd8691592d2797bbf91d2"},{"fixed":"616dc895d982026f41f500c88d1bfea004938cc8"},{"fixed":"56570bdad5e31c5c538cd6efff5c4510256e1bb4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50457.json"}}],"schema_version":"1.7.5"}