================================================================== BUG: KASAN: use-after-free in ext4_ext_binsearch fs/ext4/extents.c:826 [inline] BUG: KASAN: use-after-free in ext4_find_extent+0xbab/0xdb0 fs/ext4/extents.c:945 Read of size 4 at addr ffff88812446b784 by task kworker/u4:1/9 CPU: 0 PID: 9 Comm: kworker/u4:1 Not tainted 5.10.205-syzkaller-999740-g3d758d85a169 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Workqueue: ext4-rsv-conversion ext4_end_io_rsv_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118 print_address_description+0x81/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:435 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:452 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308 ext4_ext_binsearch fs/ext4/extents.c:826 [inline] ext4_find_extent+0xbab/0xdb0 fs/ext4/extents.c:945 ext4_ext_map_blocks+0x26d/0x6be0 fs/ext4/extents.c:4097 ext4_map_blocks+0xaa7/0x1ec0 fs/ext4/inode.c:646 ext4_convert_unwritten_extents+0x2a3/0x5a0 fs/ext4/extents.c:4808 ext4_convert_unwritten_io_end_vec+0x104/0x180 fs/ext4/extents.c:4847 ext4_end_io_end fs/ext4/page-io.c:189 [inline] ext4_do_flush_completed_IO fs/ext4/page-io.c:262 [inline] ext4_end_io_rsv_work+0x358/0x690 fs/ext4/page-io.c:276 process_one_work+0x6dc/0xbd0 kernel/workqueue.c:2301 worker_thread+0xaea/0x1510 kernel/workqueue.c:2447 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:299 The buggy address belongs to the page: page:ffffea0004911ac0 refcount:2 mapcount:0 mapping:ffff888123f82698 index:0x4 pfn:0x12446b aops:ext4_da_aops ino:13 dentry name:"hugetlb.2MB.usage_in_bytes" flags: 0x4000000000002014(uptodate|lru|private) raw: 4000000000002014 ffffea0004911a48 ffffea00049165c8 ffff888123f82698 raw: 0000000000000004 ffff888123fb79d8 00000002ffffffff ffff88810f1c6000 page dumped because: kasan: bad access detected page->mem_cgroup:ffff88810f1c6000 page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x101cca(GFP_HIGHUSER_MOVABLE|__GFP_WRITE), pid 516, ts 47639796275, free_ts 47307579384 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2456 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2462 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4254 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5346 __alloc_pages include/linux/gfp.h:544 [inline] __alloc_pages_node include/linux/gfp.h:557 [inline] alloc_pages_node include/linux/gfp.h:571 [inline] alloc_pages include/linux/gfp.h:590 [inline] __page_cache_alloc include/linux/pagemap.h:290 [inline] pagecache_get_page+0x669/0x950 mm/filemap.c:1848 grab_cache_page_write_begin+0x5d/0xa0 mm/filemap.c:3459 ext4_write_begin+0x29f/0x1730 fs/ext4/inode.c:1184 ext4_da_write_begin+0x49d/0xf60 fs/ext4/inode.c:3021 generic_perform_write+0x2cd/0x570 mm/filemap.c:3509 ext4_buffered_write_iter+0x482/0x610 fs/ext4/file.c:271 ext4_file_write_iter+0x193/0x1c80 fs/ext4/file.c:685 call_write_iter include/linux/fs.h:2019 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0xb55/0xe70 fs/read_write.c:605 ksys_write+0x199/0x2c0 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 do_syscall_64+0x34/0x70 entry_SYSCALL_64_after_hwframe+0x61/0xc6 page last free stack trace: reset_page_owner include/linux/page_owner.h:28 [inline] free_pages_prepare mm/page_alloc.c:1349 [inline] free_pcp_prepare mm/page_alloc.c:1421 [inline] free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3336 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3443 release_pages+0xea0/0xef0 mm/swap.c:1103 __pagevec_release+0x84/0x100 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] shmem_undo_range+0x7d1/0x1a60 mm/shmem.c:965 shmem_truncate_range mm/shmem.c:1069 [inline] shmem_evict_inode+0x215/0x9d0 mm/shmem.c:1169 evict+0x2a3/0x6c0 fs/inode.c:577 iput_final fs/inode.c:1697 [inline] iput+0x632/0x7e0 fs/inode.c:1723 dentry_unlink_inode+0x2e5/0x3d0 fs/dcache.c:374 __dentry_kill+0x447/0x650 fs/dcache.c:579 dentry_kill+0xc0/0x2a0 dput+0x160/0x310 fs/dcache.c:878 __fput+0x4f4/0x760 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:314 task_work_run+0x129/0x190 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop+0xbf/0xd0 kernel/entry/common.c:172 Memory state around the buggy address: ffff88812446b680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812446b700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88812446b780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88812446b800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812446b880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop5): ext4_map_blocks:716: inode #19: block 110425461583750: comm kworker/u4:1: lblock 22 mapped to illegal pblock 110425461583750 (length 1) EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4815: inode #19: block 22: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop5): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop5) in ext4_reserve_inode_write:5886: Corrupt filesystem EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4816: inode #19: comm kworker/u4:1: mark_inode_dirty error EXT4-fs (loop5): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117) EXT4-fs error (device loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0 EXT4-fs error (device loop3): __ext4_get_inode_loc:4426: comm kworker/u4:1: Invalid inode table block 34360905424 in block_group 0