{"id":"CVE-2022-49880","summary":"ext4: fix warning in 'ext4_da_release_space'","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix warning in 'ext4_da_release_space'\n\nSyzkaller report issue as follows:\nEXT4-fs (loop0): Free/Dirty block details\nEXT4-fs (loop0): free_blocks=0\nEXT4-fs (loop0): dirty_blocks=0\nEXT4-fs (loop0): Block reservation details\nEXT4-fs (loop0): i_reserved_data_blocks=0\nEXT4-fs warning (device loop0): ext4_da_release_space:1527: ext4_da_release_space: ino 18, to_free 1 with only 0 reserved data blocks\n------------[ cut here ]------------\nWARNING: CPU: 0 PID: 92 at fs/ext4/inode.c:1528 ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1524\nModules linked in:\nCPU: 0 PID: 92 Comm: kworker/u4:4 Not tainted 6.0.0-syzkaller-09423-g493ffd6605b2 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022\nWorkqueue: writeback wb_workfn (flush-7:0)\nRIP: 0010:ext4_da_release_space+0x25e/0x370 fs/ext4/inode.c:1528\nRSP: 0018:ffffc900015f6c90 EFLAGS: 00010296\nRAX: 42215896cd52ea00 RBX: 0000000000000000 RCX: 42215896cd52ea00\nRDX: 0000000000000000 RSI: 0000000080000001 RDI: 0000000000000000\nRBP: 1ffff1100e907d96 R08: ffffffff816aa79d R09: fffff520002bece5\nR10: fffff520002bece5 R11: 1ffff920002bece4 R12: ffff888021fd2000\nR13: ffff88807483ecb0 R14: 0000000000000001 R15: ffff88807483e740\nFS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00005555569ba628 CR3: 000000000c88e000 CR4: 00000000003506f0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \u003cTASK\u003e\n ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461\n mpage_release_unused_pages+0x24d/0xef0 fs/ext4/inode.c:1589\n ext4_writepages+0x12eb/0x3be0 fs/ext4/inode.c:2852\n do_writepages+0x3c3/0x680 mm/page-writeback.c:2469\n __writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587\n writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1870\n wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2044\n wb_do_writeback fs/fs-writeback.c:2187 [inline]\n wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2227\n process_one_work+0x877/0xdb0 kernel/workqueue.c:2289\n worker_thread+0xb14/0x1330 kernel/workqueue.c:2436\n kthread+0x266/0x300 kernel/kthread.c:376\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306\n \u003c/TASK\u003e\n\nAbove issue may happens as follows:\next4_da_write_begin\n  ext4_create_inline_data\n    ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);\n    ext4_set_inode_flag(inode, EXT4_INODE_INLINE_DATA);\n__ext4_ioctl\n  ext4_ext_migrate -\u003e will lead to eh-\u003eeh_entries not zero, and set extent flag\next4_da_write_begin\n  ext4_da_convert_inline_data_to_extent\n    ext4_da_write_inline_data_begin\n      ext4_da_map_blocks\n        ext4_insert_delayed_block\n\t  if (!ext4_es_scan_clu(inode, &ext4_es_is_delonly, lblk))\n\t    if (!ext4_es_scan_clu(inode, &ext4_es_is_mapped, lblk))\n\t      ext4_clu_mapped(inode, EXT4_B2C(sbi, lblk)); -\u003e will return 1\n\t       allocated = true;\n          ext4_es_insert_delayed_block(inode, lblk, allocated);\next4_writepages\n  mpage_map_and_submit_extent(handle, &mpd, &give_up_on_write); -\u003e return -ENOSPC\n  mpage_release_unused_pages(&mpd, give_up_on_write); -\u003e give_up_on_write == 1\n    ext4_es_remove_extent\n      ext4_da_release_space(inode, reserved);\n        if (unlikely(to_free \u003e ei-\u003ei_reserved_data_blocks))\n\t  -\u003e to_free == 1  but ei-\u003ei_reserved_data_blocks == 0\n\t  -\u003e then trigger warning as above\n\nTo solve above issue, forbid inode do migrate which has inline data.","modified":"2026-04-11T12:44:38.429492Z","published":"2025-05-01T14:10:27.947Z","related":["SUSE-SU-2025:01918-1","SUSE-SU-2025:01966-1","SUSE-SU-2025:01982-1","SUSE-SU-2025:01983-1","SUSE-SU-2025:01995-1","SUSE-SU-2025:02173-1","SUSE-SU-2025:02262-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49880.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0a43c015e98121c91a76154edf42280ce1a8a883"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0de5ee103747fd3a24f1c010c79caabe35e8f0bb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1b8f787ef547230a3249bcf897221ef0cc78481b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5370b965b7a945bb8f48b9ee23d83a76a947902e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72743d5598b9096950bbfd6a9b7f173d156eea97"},{"type":"WEB","url":"https://git.kernel.org/stable/c/890d738f569fa9412b70ba09f15407f17a52da20"},{"type":"WEB","url":"https://git.kernel.org/stable/c/89bee03d2fb8c54119b38ac6c24e7d60fae036b6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c3bf1e95cfa7d950dc3c064d0c2e3d06b427bc63"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49880.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-49880"},{"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":"67cf5b09a46f72e048501b84996f2f77bc42e947"},{"fixed":"0de5ee103747fd3a24f1c010c79caabe35e8f0bb"},{"fixed":"c3bf1e95cfa7d950dc3c064d0c2e3d06b427bc63"},{"fixed":"890d738f569fa9412b70ba09f15407f17a52da20"},{"fixed":"72743d5598b9096950bbfd6a9b7f173d156eea97"},{"fixed":"5370b965b7a945bb8f48b9ee23d83a76a947902e"},{"fixed":"0a43c015e98121c91a76154edf42280ce1a8a883"},{"fixed":"89bee03d2fb8c54119b38ac6c24e7d60fae036b6"},{"fixed":"1b8f787ef547230a3249bcf897221ef0cc78481b"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49880.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.8.0"},{"fixed":"4.9.333"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"4.14.299"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.224"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.154"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.78"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.0.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49880.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}