================================================================== BUG: KASAN: out-of-bounds in ext4_ext_rm_leaf fs/ext4/extents.c:2736 [inline] BUG: KASAN: out-of-bounds in ext4_ext_remove_space+0x2482/0x4d90 fs/ext4/extents.c:2958 Read of size 18446744073709551508 at addr ffff8880588f8078 by task syz-executor.2/5886 CPU: 0 PID: 5886 Comm: syz-executor.2 Not tainted 6.6.0-syzkaller-12401-g8f6f76a6a29f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x142/0x170 mm/kasan/report.c:588 kasan_check_range+0x27e/0x290 mm/kasan/generic.c:187 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_ext_rm_leaf fs/ext4/extents.c:2736 [inline] ext4_ext_remove_space+0x2482/0x4d90 fs/ext4/extents.c:2958 ext4_punch_hole+0x780/0xbc0 fs/ext4/inode.c:4019 ext4_fallocate+0x311/0x1f50 fs/ext4/extents.c:4707 vfs_fallocate+0x551/0x6b0 fs/open.c:324 do_vfs_ioctl+0x22da/0x2b40 fs/ioctl.c:850 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f92a187cb29 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f92a26a10c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f92a199c050 RCX: 00007f92a187cb29 RDX: 0000000020000080 RSI: 000000004030582b RDI: 0000000000000004 RBP: 00007f92a18c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f92a199c050 R15: 00007ffe95970a08 The buggy address belongs to the physical page: page:ffffea0001623e00 refcount:2 mapcount:0 mapping:ffff88801b086ff8 index:0x2b pfn:0x588f8 memcg:ffff88801c422000 aops:def_blk_aops ino:700002 flags: 0xfff0000000812c(referenced|uptodate|lru|active|private|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff0000000812c ffffea000162a188 ffff88801ff0c030 ffff88801b086ff8 raw: 000000000000002b ffff88806a2552b8 00000002ffffffff ffff88801c422000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x140c48(GFP_NOFS|__GFP_COMP|__GFP_HARDWALL|__GFP_MOVABLE), pid 5870, tgid 5868 (syz-executor.2), ts 101055414899, free_ts 100167803726 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1537 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x339a/0x3530 mm/page_alloc.c:3312 __alloc_pages+0x255/0x670 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 alloc_pages mm/mempolicy.c:2204 [inline] folio_alloc+0x12a/0x330 mm/mempolicy.c:2211 filemap_alloc_folio+0xde/0x500 mm/filemap.c:974 __filemap_get_folio+0x431/0xbb0 mm/filemap.c:1918 grow_dev_page fs/buffer.c:1041 [inline] grow_buffers fs/buffer.c:1106 [inline] __getblk_slow fs/buffer.c:1133 [inline] bdev_getblk+0x246/0x6d0 fs/buffer.c:1429 sb_getblk_gfp include/linux/buffer_head.h:370 [inline] ext4_ext_grow_indepth fs/ext4/extents.c:1334 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1435 [inline] ext4_ext_insert_extent+0xfe3/0x4f00 fs/ext4/extents.c:2102 ext4_ext_map_blocks+0x207c/0x7150 fs/ext4/extents.c:4306 ext4_map_blocks+0xa2f/0x1cb0 fs/ext4/inode.c:621 _ext4_get_block+0x238/0x6a0 fs/ext4/inode.c:763 ext4_block_write_begin+0x537/0x1840 fs/ext4/inode.c:1053 ext4_write_begin+0x619/0x10b0 ext4_da_write_begin+0x300/0xa40 fs/ext4/inode.c:2875 generic_perform_write+0x31b/0x630 mm/filemap.c:3918 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1137 [inline] free_unref_page_prepare+0x92a/0xa50 mm/page_alloc.c:2347 free_unref_page_list+0x596/0x830 mm/page_alloc.c:2533 release_pages+0x2113/0x23f0 mm/swap.c:1042 __folio_batch_release+0x84/0x100 mm/swap.c:1062 folio_batch_release include/linux/pagevec.h:83 [inline] shmem_undo_range+0x6aa/0x19c0 mm/shmem.c:1004 shmem_truncate_range mm/shmem.c:1096 [inline] shmem_evict_inode+0x29b/0xa60 mm/shmem.c:1224 evict+0x2a4/0x620 fs/inode.c:664 __dentry_kill+0x436/0x650 fs/dcache.c:607 dentry_kill+0xbb/0x290 dput+0x21e/0x470 fs/dcache.c:913 __fput+0x60b/0xa10 fs/file_table.c:402 task_work_run+0x24a/0x300 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x50/0x110 arch/x86/entry/common.c:88 Memory state around the buggy address: ffff8880588f7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880588f7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880588f8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880588f8080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880588f8100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================