{"schema_version":"1.9.0","id":"CVE-2022-49708","published":"2025-02-26T02:24:26.142Z","modified":"2026-08-12T03:51:41.404463899Z","related":["SUSE-SU-2025:1027-1","SUSE-SU-2025:1176-1","SUSE-SU-2025:1183-1","SUSE-SU-2025:1194-1","SUSE-SU-2025:1241-1","SUSE-SU-2025:1263-1","SUSE-SU-2025:1293-1"],"summary":"ext4: fix bug_on ext4_mb_use_inode_pa","details":"In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug_on ext4_mb_use_inode_pa\n\nHulk Robot reported a BUG_ON:\n==================================================================\nkernel BUG at fs/ext4/mballoc.c:3211!\n[...]\nRIP: 0010:ext4_mb_mark_diskspace_used.cold+0x85/0x136f\n[...]\nCall Trace:\n ext4_mb_new_blocks+0x9df/0x5d30\n ext4_ext_map_blocks+0x1803/0x4d80\n ext4_map_blocks+0x3a4/0x1a10\n ext4_writepages+0x126d/0x2c30\n do_writepages+0x7f/0x1b0\n __filemap_fdatawrite_range+0x285/0x3b0\n file_write_and_wait_range+0xb1/0x140\n ext4_sync_file+0x1aa/0xca0\n vfs_fsync_range+0xfb/0x260\n do_fsync+0x48/0xa0\n[...]\n==================================================================\n\nAbove issue may happen as follows:\n-------------------------------------\ndo_fsync\n vfs_fsync_range\n  ext4_sync_file\n   file_write_and_wait_range\n    __filemap_fdatawrite_range\n     do_writepages\n      ext4_writepages\n       mpage_map_and_submit_extent\n        mpage_map_one_extent\n         ext4_map_blocks\n          ext4_mb_new_blocks\n           ext4_mb_normalize_request\n            >>> start + size <= ac->ac_o_ex.fe_logical\n           ext4_mb_regular_allocator\n            ext4_mb_simple_scan_group\n             ext4_mb_use_best_found\n              ext4_mb_new_preallocation\n               ext4_mb_new_inode_pa\n                ext4_mb_use_inode_pa\n                 >>> set ac->ac_b_ex.fe_len <= 0\n           ext4_mb_mark_diskspace_used\n            >>> BUG_ON(ac->ac_b_ex.fe_len <= 0);\n\nwe can easily reproduce this problem with the following commands:\n\t`fallocate -l100M disk`\n\t`mkfs.ext4 -b 1024 -g 256 disk`\n\t`mount disk /mnt`\n\t`fsstress -d /mnt -l 0 -n 1000 -p 1`\n\nThe size must be smaller than or equal to EXT4_BLOCKS_PER_GROUP.\nTherefore, \"start + size <= ac->ac_o_ex.fe_logical\" may occur\nwhen the size is truncated. So start should be the start position of\nthe group where ac_o_ex.fe_logical is located after alignment.\nIn addition, when the value of fe_logical or EXT4_BLOCKS_PER_GROUP\nis very large, the value calculated by start_off is more 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