{"id":"CVE-2022-50743","summary":"erofs: Fix pcluster memleak when its block address is zero","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nerofs: Fix pcluster memleak when its block address is zero\n\nsyzkaller reported a memleak:\nhttps://syzkaller.appspot.com/bug?id=62f37ff612f0021641eda5b17f056f1668aa9aed\n\nunreferenced object 0xffff88811009c7f8 (size 136):\n  ...\n  backtrace:\n    [\u003cffffffff821db19b\u003e] z_erofs_do_read_page+0x99b/0x1740\n    [\u003cffffffff821dee9e\u003e] z_erofs_readahead+0x24e/0x580\n    [\u003cffffffff814bc0d6\u003e] read_pages+0x86/0x3d0\n    ...\n\nsyzkaller constructed a case: in z_erofs_register_pcluster(),\nztailpacking = false and map-\u003em_pa = zero. This makes pcl-\u003eobj.index be\nzero although pcl is not a inline pcluster.\n\nThen following path adds refcount for grp, but the refcount won't be put\nbecause pcl is inline.\n\nz_erofs_readahead()\n  z_erofs_do_read_page() # for another page\n    z_erofs_collector_begin()\n      erofs_find_workgroup()\n        erofs_workgroup_get()\n\nSince it's illegal for the block address of a non-inlined pcluster to\nbe zero, add check here to avoid registering the pcluster which would\nbe leaked.","modified":"2026-04-02T08:28:44.067441Z","published":"2025-12-24T13:05:40.297Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50743.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/618e712b99c78d1004b70a1a9ab0a4830d0b2673"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ac54c1f7b288d83b6ba1e320efff24ecc21309cd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c42c0ffe81176940bd5dead474216b7198d77675"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50743.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50743"},{"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":"cecf864d3d76d50e3d9c58145e286a0b8c284e92"},{"fixed":"ac54c1f7b288d83b6ba1e320efff24ecc21309cd"},{"fixed":"618e712b99c78d1004b70a1a9ab0a4830d0b2673"},{"fixed":"c42c0ffe81176940bd5dead474216b7198d77675"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50743.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"6.0.16"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.1.0"},{"fixed":"6.1.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50743.json"}}],"schema_version":"1.7.5"}