{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-68772",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2025-68772"
  ],
  "published": "2026-01-13T15:29:33Z",
  "summary": "f2fs: fix to avoid updating compression context during writeback",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid updating compression context during writeback\n\nBai, Shuangpeng <sjb7183@psu.edu> reported a bug as below:\n\nOops: divide error: 0000 [#1] SMP KASAN PTI\nCPU: 0 UID: 0 PID: 11441 Comm: syz.0.46 Not tainted 6.17.0 #1 PREEMPT(full)\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\nRIP: 0010:f2fs_all_cluster_page_ready+0x106/0x550 fs/f2fs/compress.c:857\nCall Trace:\n <TASK>\n f2fs_write_cache_pages fs/f2fs/data.c:3078 [inline]\n __f2fs_write_data_pages fs/f2fs/data.c:3290 [inline]\n f2fs_write_data_pages+0x1c19/0x3600 fs/f2fs/data.c:3317\n do_writepages+0x38e/0x640 mm/page-writeback.c:2634\n filemap_fdatawrite_wbc mm/filemap.c:386 [inline]\n __filemap_fdatawrite_range mm/filemap.c:419 [inline]\n file_write_and_wait_range+0x2ba/0x3e0 mm/filemap.c:794\n f2fs_do_sync_file+0x6e6/0x1b00 fs/f2fs/file.c:294\n generic_write_sync include/linux/fs.h:3043 [inline]\n f2fs_file_write_iter+0x76e/0x2700 fs/f2fs/file.c:5259\n new_sync_write fs/read_write.c:593 [inline]\n vfs_write+0x7e9/0xe00 fs/read_write.c:686\n ksys_write+0x19d/0x2d0 fs/read_write.c:738\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xf7/0x470 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThe bug was triggered w/ below race condition:\n\nfsync\t\t\t\tsetattr\t\t\tioctl\n- f2fs_do_sync_file\n - file_write_and_wait_range\n  - f2fs_write_cache_pages\n  : inode is non-compressed\n  : cc.cluster_size =\n    F2FS_I(inode)->i_cluster_size = 0\n   - tag_pages_for_writeback\n\t\t\t\t- f2fs_setattr\n\t\t\t\t - truncate_setsize\n\t\t\t\t - f2fs_truncate\n\t\t\t\t\t\t\t- f2fs_fileattr_set\n\t\t\t\t\t\t\t - f2fs_setflags_common\n\t\t\t\t\t\t\t  - set_compress_context\n\t\t\t\t\t\t\t  : F2FS_I(inode)->i_cluster_size = 4\n\t\t\t\t\t\t\t  : set_inode_flag(inode, FI_COMPRESSED_FILE)\n   - f2fs_compressed_file\n   : return true\n   - f2fs_all_cluster_page_ready\n   : \"pgidx % cc->cluster_size\" trigger dividing 0 issue\n\nLet's change as below to fix this issue:\n- introduce a new atomic type variable .writeback in structure f2fs_inode_info\nto track the number of threads which calling f2fs_write_cache_pages().\n- use .i_sem lock to protect .writeback update.\n- check .writeback before update compression context in f2fs_setflags_common()\nto avoid race w/ ->writepages.",
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