{"id":"CVE-2022-50457","revision":"d860bad501a545d9bfc907d83045ed09","records":[{"revision":"d860bad501a545d9bfc907d83045ed09","observedAt":"2026-10-30T13:45:33.454+00:00","statement":{"source":"cve-program","id":"CVE-2022-50457","aliases":[],"title":"mtd: core: Fix refcount error in del_mtd_device()","description":"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->dev.of_node. However, memset(&mtd->dev, 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->dev, 0, sizeof(mtd->dev) # clear mtd->dev\n    of_node_put()\n        mtd_get_of_node(mtd) # mtd->dev 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<TASK>\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[<miquel.raynal@bootlin.com>: Light reword of the commit log]","state":0,"publishedAt":"2025-10-01T11:45:30.263+00:00","modifiedAt":"2026-10-30T12:17:10.412+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/mtd/mtdcore.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"63aff1411fc609d737830b79c6b06ce62348c582\",\n                            \"lessThan\": \"0de86087b20675c53fda2bc903dfc26a7ec99856\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00596576a05145a1b5672897a82ef87af00becf4\",\n                            \"lessThan\": \"f6016557f1ef7735963bd8691592d2797bbf91d2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00596576a05145a1b5672897a82ef87af00becf4\",\n                            \"lessThan\": \"616dc895d982026f41f500c88d1bfea004938cc8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"00596576a05145a1b5672897a82ef87af00becf4\",\n                            \"lessThan\": \"56570bdad5e31c5c538cd6efff5c4510256e1bb4\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/mtd/mtdcore.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.0.16\",\n                            \"lessThanOrEqual\": \"6.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.2\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/0de86087b20675c53fda2bc903dfc26a7ec99856","https://git.kernel.org/stable/c/f6016557f1ef7735963bd8691592d2797bbf91d2","https://git.kernel.org/stable/c/616dc895d982026f41f500c88d1bfea004938cc8","https://git.kernel.org/stable/c/56570bdad5e31c5c538cd6efff5c4510256e1bb4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2022-50457","license":"CVE Program Terms of Use","key":"cve-program:CVE-2022-50457","identifiers":["CVE-2022-50457"]},"retained":false,"historicalAffected":[]}],"coverage":[]}