================================================================== BUG: KASAN: out-of-bounds in ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1763 Read of size 18446744073709551600 at addr ffff8880507c45b8 by task syz.0.0/5336 CPU: 0 UID: 0 PID: 5336 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description+0x55/0x1e0 mm/kasan/report.c:378 print_report+0x58/0x70 mm/kasan/report.c:482 kasan_report+0x117/0x150 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memmove+0x29/0x70 mm/kasan/shadow.c:94 ext4_xattr_set_entry+0x9c1/0x1e20 fs/ext4/xattr.c:1763 ext4_xattr_ibody_set+0x254/0x6a0 fs/ext4/xattr.c:2275 ext4_destroy_inline_data_nolock+0x23a/0x5e0 fs/ext4/inline.c:472 ext4_convert_inline_data_to_extent+0x547/0xde0 fs/ext4/inline.c:631 ext4_write_begin+0x357/0x1890 fs/ext4/inode.c:1315 generic_perform_write+0x2e2/0x8f0 mm/filemap.c:4325 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:316 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1 aio_write+0x5cd/0x870 fs/aio.c:1688 __io_submit_one fs/aio.c:-1 [inline] io_submit_one+0x7bb/0x14c0 fs/aio.c:2107 __do_sys_io_submit fs/aio.c:2166 [inline] __se_sys_io_submit+0x195/0x340 fs/aio.c:2136 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f03a559ce59 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f03a19d3fe8 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f03a5816180 RCX: 00007f03a559ce59 RDX: 0000200000000540 RSI: 000000000000003b RDI: 00007f03a6361000 RBP: 00007f03a5632d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f03a5816218 R14: 00007f03a5816180 R15: 00007fff864de578 The buggy address belongs to the physical page: page: refcount:2 mapcount:0 mapping:ffff88801cc25940 index:0x2 pfn:0x507c4 memcg:ffff88801f814c00 aops:def_blk_aops ino:700000 dentry name(?):"" flags: 0x4fff38000004234(referenced|dirty|lru|workingset|private|node=1|zone=1|lastcpupid=0x7ff) raw: 04fff38000004234 ffffea0001560688 ffffea0001074a88 ffff88801cc25940 raw: 0000000000000002 ffff8880478accb0 00000002ffffffff ffff88801f814c00 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Movable, gfp_mask 0x148c48(GFP_NOFS|__GFP_MOVABLE|__GFP_NOFAIL|__GFP_COMP|__GFP_HARDWALL), pid 5336, tgid 5324 (syz.0.0), ts 85609383829, free_ts 85594861822 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x22d/0x280 mm/page_alloc.c:1853 prep_new_page mm/page_alloc.c:1861 [inline] get_page_from_freelist+0x2593/0x2610 mm/page_alloc.c:3941 __alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5221 alloc_pages_mpol+0x235/0x490 mm/mempolicy.c:2490 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline] alloc_pages_noprof+0xac/0x2a0 mm/mempolicy.c:2581 folio_alloc_noprof+0x1e/0x30 mm/mempolicy.c:2591 filemap_alloc_folio_noprof+0x111/0x470 mm/filemap.c:1014 __filemap_get_folio_mpol+0x3fc/0xb00 mm/filemap.c:2012 __filemap_get_folio include/linux/pagemap.h:763 [inline] grow_dev_folio fs/buffer.c:954 [inline] grow_buffers fs/buffer.c:1020 [inline] __getblk_slow fs/buffer.c:1038 [inline] bdev_getblk+0x1f6/0x6e0 fs/buffer.c:1358 __getblk include/linux/buffer_head.h:380 [inline] sb_getblk include/linux/buffer_head.h:386 [inline] __ext4_get_inode_loc+0x528/0xfa0 fs/ext4/inode.c:4890 ext4_get_inode_loc fs/ext4/inode.c:5018 [inline] ext4_reserve_inode_write+0x18b/0x360 fs/ext4/inode.c:6372 __ext4_mark_inode_dirty+0x14b/0x710 fs/ext4/inode.c:6550 ext4_dirty_inode+0xd0/0x110 fs/ext4/inode.c:6587 __mark_inode_dirty+0x3a4/0x13b0 fs/fs-writeback.c:2623 generic_update_time fs/inode.c:2198 [inline] file_update_time_flags+0x3ee/0x4a0 fs/inode.c:2428 ext4_write_checks+0x2a9/0x480 fs/ext4/file.c:281 page last free pid 5333 tgid 5333 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1397 [inline] free_unref_folios+0xd9f/0x14c0 mm/page_alloc.c:2999 folios_put_refs+0x9ff/0xb40 mm/swap.c:1008 free_pages_and_swap_cache+0x41d/0x490 mm/swap_state.c:404 __tlb_batch_free_encoded_pages mm/mmu_gather.c:138 [inline] tlb_batch_pages_flush mm/mmu_gather.c:151 [inline] tlb_flush_mmu_free mm/mmu_gather.c:417 [inline] tlb_flush_mmu+0x6d3/0xa30 mm/mmu_gather.c:424 tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:549 exit_mmap+0x498/0x9e0 mm/mmap.c:1313 __mmput+0x118/0x430 kernel/fork.c:1178 exit_mm+0x1f6/0x2d0 kernel/exit.c:582 do_exit+0x6a2/0x22c0 kernel/exit.c:964 do_group_exit+0x21b/0x2d0 kernel/exit.c:1119 __do_sys_exit_group kernel/exit.c:1130 [inline] __se_sys_exit_group kernel/exit.c:1128 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1128 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff8880507c4480: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880507c4500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8880507c4580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8880507c4600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880507c4680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================