{"id":"CVE-2022-49170","summary":"f2fs: fix to do sanity check on curseg-\u003ealloc_type","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to do sanity check on curseg-\u003ealloc_type\n\nAs Wenqing Liu reported in bugzilla:\n\nhttps://bugzilla.kernel.org/show_bug.cgi?id=215657\n\n- Overview\nUBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 when mount and operate a corrupted image\n\n- Reproduce\ntested on kernel 5.17-rc4, 5.17-rc6\n\n1. mkdir test_crash\n2. cd test_crash\n3. unzip tmp2.zip\n4. mkdir mnt\n5. ./single_test.sh f2fs 2\n\n- Kernel dump\n[   46.434454] loop0: detected capacity change from 0 to 131072\n[   46.529839] F2FS-fs (loop0): Mounted with checkpoint version = 7548c2d9\n[   46.738319] ================================================================================\n[   46.738412] UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2\n[   46.738475] index 231 is out of range for type 'unsigned int [2]'\n[   46.738539] CPU: 2 PID: 939 Comm: umount Not tainted 5.17.0-rc6 #1\n[   46.738547] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014\n[   46.738551] Call Trace:\n[   46.738556]  \u003cTASK\u003e\n[   46.738563]  dump_stack_lvl+0x47/0x5c\n[   46.738581]  ubsan_epilogue+0x5/0x50\n[   46.738592]  __ubsan_handle_out_of_bounds+0x68/0x80\n[   46.738604]  f2fs_allocate_data_block+0xdff/0xe60 [f2fs]\n[   46.738819]  do_write_page+0xef/0x210 [f2fs]\n[   46.738934]  f2fs_do_write_node_page+0x3f/0x80 [f2fs]\n[   46.739038]  __write_node_page+0x2b7/0x920 [f2fs]\n[   46.739162]  f2fs_sync_node_pages+0x943/0xb00 [f2fs]\n[   46.739293]  f2fs_write_checkpoint+0x7bb/0x1030 [f2fs]\n[   46.739405]  kill_f2fs_super+0x125/0x150 [f2fs]\n[   46.739507]  deactivate_locked_super+0x60/0xc0\n[   46.739517]  deactivate_super+0x70/0xb0\n[   46.739524]  cleanup_mnt+0x11a/0x200\n[   46.739532]  __cleanup_mnt+0x16/0x20\n[   46.739538]  task_work_run+0x67/0xa0\n[   46.739547]  exit_to_user_mode_prepare+0x18c/0x1a0\n[   46.739559]  syscall_exit_to_user_mode+0x26/0x40\n[   46.739568]  do_syscall_64+0x46/0xb0\n[   46.739584]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nThe root cause is we missed to do sanity check on curseg-\u003ealloc_type,\nresult in out-of-bound accessing on sbi-\u003eblock_count[] array, fix it.","modified":"2026-05-28T03:53:30.094754185Z","published":"2025-02-26T01:55:27.562Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49170.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0748a0f7dcb9d9dddc80302d73ebcecef6782ef0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/498b7088db71f9707359448cd6800bbb1882f4c3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c12765e3f129b144421c80d3383df885f85ee290"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f41ee8b91c00770d718be2ff4852a80017ae9ab3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f68caedf264a95c0b02dfd0d9f92ac2637d5848a"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49170.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49170"},{"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":"98e4da8ca301e062d79ae168c67e56f3c3de3ce4"},{"fixed":"498b7088db71f9707359448cd6800bbb1882f4c3"},{"fixed":"f68caedf264a95c0b02dfd0d9f92ac2637d5848a"},{"fixed":"0748a0f7dcb9d9dddc80302d73ebcecef6782ef0"},{"fixed":"c12765e3f129b144421c80d3383df885f85ee290"},{"fixed":"f41ee8b91c00770d718be2ff4852a80017ae9ab3"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49170.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"5.10.110"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.16.19"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.17.0"},{"fixed":"5.17.2"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49170.json"}}],"schema_version":"1.7.5"}