================================================================== 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 ffff888124a65138 by task kworker/u4:5/403 CPU: 0 PID: 403 Comm: kworker/u4:5 Not tainted 5.10.178-syzkaller-989015-g43c801dc3325 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 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+0xaa7/0x1f00 fs/ext4/inode.c:646 ext4_convert_unwritten_extents+0x2a3/0x5a0 fs/ext4/extents.c:4810 ext4_convert_unwritten_io_end_vec+0x104/0x180 fs/ext4/extents.c:4849 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:2298 worker_thread+0xaea/0x1510 kernel/workqueue.c:2444 kthread+0x34b/0x3d0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 :299 The buggy address belongs to the page: page:ffffea0004929940 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x124a65 flags: 0x4000000000000000() raw: 4000000000000000 ffffea0004929988 ffffea0004929908 0000000000000000 raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as freed page last allocated via order 0, migratetype Movable, gfp_mask 0x101cca(GFP_HIGHUSER_MOVABLE|__GFP_WRITE), pid 466, ts 41173697750, free_ts 41335019631 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook mm/page_alloc.c:2455 [inline] prep_new_page+0x166/0x180 mm/page_alloc.c:2461 get_page_from_freelist+0x2d8c/0x2f30 mm/page_alloc.c:4253 __alloc_pages_nodemask+0x435/0xaf0 mm/page_alloc.c:5345 __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:3451 ext4_write_begin+0x29f/0x1730 fs/ext4/inode.c:1194 ext4_da_write_begin+0x49d/0xf60 fs/ext4/inode.c:3031 generic_perform_write+0x2cd/0x570 mm/filemap.c:3501 ext4_buffered_write_iter+0x47d/0x610 fs/ext4/file.c:272 ext4_file_write_iter+0x193/0x1ca0 fs/ext4/file.c:689 call_write_iter include/linux/fs.h:1976 [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:1348 [inline] free_pcp_prepare mm/page_alloc.c:1420 [inline] free_unref_page_prepare+0x2ae/0x2d0 mm/page_alloc.c:3335 free_unref_page_list+0x122/0xb20 mm/page_alloc.c:3442 release_pages+0xea0/0xef0 mm/swap.c:1103 __pagevec_release+0x84/0x100 mm/swap.c:1123 pagevec_release include/linux/pagevec.h:88 [inline] truncate_inode_pages_range+0xa81/0x1ae0 mm/truncate.c:367 truncate_inode_pages mm/truncate.c:473 [inline] truncate_inode_pages_final+0xc1/0xd0 mm/truncate.c:524 ext4_evict_inode+0x3d7/0x1730 fs/ext4/inode.c:214 evict+0x2a3/0x6c0 fs/inode.c:577 dispose_list fs/inode.c:612 [inline] evict_inodes+0x5d1/0x650 fs/inode.c:662 generic_shutdown_super+0x9c/0x2d0 fs/super.c:454 kill_block_super+0x7e/0xe0 fs/super.c:1447 deactivate_locked_super+0xad/0x110 fs/super.c:335 deactivate_super+0xbe/0xf0 fs/super.c:366 cleanup_mnt+0x45c/0x510 fs/namespace.c:1118 __cleanup_mnt+0x19/0x20 fs/namespace.c:1125 task_work_run+0x129/0x190 kernel/task_work.c:164 Memory state around the buggy address: ffff888124a65000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888124a65080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff >ffff888124a65100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ^ ffff888124a65180: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ffff888124a65200: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ================================================================== EXT4-fs error (device loop5): ext4_map_blocks:726: inode #19: block 88248693030955: comm kworker/u4:5: lblock 11 mapped to illegal pblock 88248693030955 (length 1) EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4817: inode #19: block 11: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop5): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop5) in ext4_reserve_inode_write:5877: Corrupt filesystem EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:5: 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 loop5): ext4_map_blocks:726: inode #19: block 88248693030956: comm kworker/u4:5: lblock 12 mapped to illegal pblock 88248693030956 (length 1) EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4817: inode #19: block 12: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop5): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop5) in ext4_reserve_inode_write:5877: Corrupt filesystem EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:5: 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 loop5): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop2): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop4): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop5): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop1): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop5): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop5): ext4_map_blocks:726: inode #19: block 239: comm kworker/u4:5: lblock 31 mapped to illegal pblock 239 (length 1) EXT4-fs warning (device loop5): ext4_convert_unwritten_extents:4817: inode #19: block 31: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop5): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop5) in ext4_reserve_inode_write:5877: Corrupt filesystem EXT4-fs error (device loop5): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:5: 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 loop2): ext4_map_blocks:726: inode #19: block 192: comm kworker/u4:5: lblock 0 mapped to illegal pblock 192 (length 1) EXT4-fs warning (device loop2): ext4_convert_unwritten_extents:4817: inode #19: block 0: len 1: ext4_ext_map_blocks returned -117 EXT4-fs error (device loop2): __ext4_get_inode_loc:4436: comm kworker/u4:5: Invalid inode table block 34360965232 in block_group 0 EXT4-fs error (device loop2) in ext4_reserve_inode_write:5877: Corrupt filesystem EXT4-fs error (device loop2): ext4_convert_unwritten_extents:4818: inode #19: comm kworker/u4:5: mark_inode_dirty error EXT4-fs (loop2): failed to convert unwritten extents to written extents -- potential data loss! (inode 19, error -117)