================================================================== BUG: KASAN: out-of-bounds in ext4_ext_rm_leaf fs/ext4/extents.c:2711 [inline] BUG: KASAN: out-of-bounds in ext4_ext_remove_space+0x2149/0x4a60 fs/ext4/extents.c:2933 Read of size 18446744073709551604 at addr ffff88812537e018 by task syz.2.603/2111 CPU: 1 PID: 2111 Comm: syz.2.603 Tainted: G W 5.15.151-syzkaller-00415-gdb06c48ab67e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106 print_address_description+0x87/0x3b0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0x179/0x1c0 mm/kasan/report.c:444 kasan_check_range+0x293/0x2a0 mm/kasan/generic.c:189 memmove+0x2d/0x70 mm/kasan/shadow.c:54 ext4_ext_rm_leaf fs/ext4/extents.c:2711 [inline] ext4_ext_remove_space+0x2149/0x4a60 fs/ext4/extents.c:2933 ext4_punch_hole+0x794/0xbf0 fs/ext4/inode.c:4119 ext4_fallocate+0x30c/0x1f10 fs/ext4/extents.c:4740 vfs_fallocate+0x492/0x570 fs/open.c:309 ksys_fallocate fs/open.c:332 [inline] __do_sys_fallocate fs/open.c:340 [inline] __se_sys_fallocate fs/open.c:338 [inline] __x64_sys_fallocate+0xc0/0x110 fs/open.c:338 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fe8bff5bb59 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe8bf1bc048 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fe8c00ec038 RCX: 00007fe8bff5bb59 RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004 RBP: 00007fe8bffcae5d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000001a00 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fe8c00ec038 R15: 00007fffc7f3d9b8 The buggy address belongs to the page: page:ffffea000494df80 refcount:2 mapcount:0 mapping:ffff88810919d358 index:0x27 pfn:0x12537e memcg:ffff88810af28000 aops:def_blk_aops ino:700002 flags: 0x4000000000002036(referenced|uptodate|lru|active|private|zone=1) raw: 4000000000002036 ffffea0004624d48 ffff88810c215030 ffff88810919d358 raw: 0000000000000027 ffff888122f15d20 00000002ffffffff ffff88810af28000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x108c48(GFP_NOFS|__GFP_NOFAIL|__GFP_HARDWALL|__GFP_MOVABLE), pid 2103, ts 101677048001, free_ts 100543293077 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1a3/0x1b0 mm/page_alloc.c:2604 prep_new_page+0x1b/0x110 mm/page_alloc.c:2610 get_page_from_freelist+0x3550/0x35d0 mm/page_alloc.c:4484 __alloc_pages+0x27e/0x8f0 mm/page_alloc.c:5776 __alloc_pages_node include/linux/gfp.h:591 [inline] alloc_pages_node include/linux/gfp.h:605 [inline] alloc_pages include/linux/gfp.h:618 [inline] __page_cache_alloc include/linux/pagemap.h:305 [inline] pagecache_get_page+0xb18/0xeb0 mm/filemap.c:1946 find_or_create_page include/linux/pagemap.h:418 [inline] grow_dev_page fs/buffer.c:949 [inline] grow_buffers fs/buffer.c:1014 [inline] __getblk_slow fs/buffer.c:1041 [inline] __getblk_gfp+0x21e/0x7c0 fs/buffer.c:1336 sb_getblk_gfp include/linux/buffer_head.h:368 [inline] ext4_ext_grow_indepth fs/ext4/extents.c:1328 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1429 [inline] ext4_ext_insert_extent+0xf7a/0x4b10 fs/ext4/extents.c:2099 ext4_split_extent_at+0x80e/0x10f0 fs/ext4/extents.c:3229 ext4_split_extent+0x1bd/0x4e0 fs/ext4/extents.c:3330 ext4_split_convert_extents fs/ext4/extents.c:3690 [inline] ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3852 [inline] ext4_ext_map_blocks+0x223e/0x74a0 fs/ext4/extents.c:4207 ext4_map_blocks+0xaa7/0x1e00 fs/ext4/inode.c:646 _ext4_get_block+0x23b/0x660 fs/ext4/inode.c:793 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:824 __block_write_begin_int+0x58a/0x1580 fs/buffer.c:2012 __block_write_begin fs/buffer.c:2062 [inline] block_page_mkwrite+0x205/0x270 fs/buffer.c:2525 ext4_page_mkwrite+0x4c1/0x13a0 fs/ext4/inode.c:6219 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1471 [inline] free_pcp_prepare mm/page_alloc.c:1543 [inline] free_unref_page_prepare+0x7c8/0x7d0 mm/page_alloc.c:3533 free_unref_page_list+0x14b/0xa60 mm/page_alloc.c:3670 release_pages+0x1310/0x1370 mm/swap.c:1009 __pagevec_release+0x84/0x100 mm/swap.c:1029 pagevec_release include/linux/pagevec.h:81 [inline] shmem_undo_range+0x604/0x1560 mm/shmem.c:965 shmem_truncate_range mm/shmem.c:1064 [inline] shmem_evict_inode+0x215/0x9d0 mm/shmem.c:1146 evict+0x2a3/0x630 fs/inode.c:587 iput_final fs/inode.c:1705 [inline] iput+0x63b/0x7e0 fs/inode.c:1731 dentry_unlink_inode+0x34f/0x440 fs/dcache.c:376 __dentry_kill+0x447/0x660 fs/dcache.c:582 dentry_kill+0xc0/0x2a0 dput+0x45/0x80 fs/dcache.c:889 __fput+0x662/0x910 fs/file_table.c:288 ____fput+0x15/0x20 fs/file_table.c:308 task_work_run+0x129/0x190 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xc48/0x2ca0 kernel/exit.c:878 Memory state around the buggy address: ffff88812537df00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812537df80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88812537e000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88812537e080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88812537e100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ================================================================== EXT4-fs error (device loop2) in ext4_reserve_inode_write:5820: Corrupt filesystem EXT4-fs error (device loop2): __ext4_ext_dirty:183: inode #16: comm syz.2.603: mark_inode_dirty error EXT4-fs error (device loop2) in ext4_reserve_inode_write:5820: Corrupt filesystem EXT4-fs error (device loop2): ext4_punch_hole:4132: inode #16: comm syz.2.603: mark_inode_dirty error