================================================================== BUG: KASAN: slab-use-after-free in ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5967 [inline] BUG: KASAN: slab-use-after-free in __ocfs2_flush_truncate_log+0x7c7/0x10e0 fs/ocfs2/alloc.c:6062 Read of size 4 at addr ffff888044c8e2c0 by task syz-executor/5858 CPU: 0 UID: 0 PID: 5858 Comm: syz-executor Not tainted 6.17.0-rc1-syzkaller-00014-g0e39a731820a #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 ocfs2_replay_truncate_records fs/ocfs2/alloc.c:5967 [inline] __ocfs2_flush_truncate_log+0x7c7/0x10e0 fs/ocfs2/alloc.c:6062 ocfs2_flush_truncate_log+0x4f/0x70 fs/ocfs2/alloc.c:6084 ocfs2_sync_fs+0x116/0x310 fs/ocfs2/super.c:406 sync_filesystem+0x1cc/0x230 fs/sync.c:66 generic_shutdown_super+0x6f/0x2c0 fs/super.c:622 kill_block_super+0x44/0x90 fs/super.c:1766 deactivate_locked_super+0xb9/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1378 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f87cff8e117 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fff5a7aa6f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f87d000e08c RCX: 00007f87cff8e117 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff5a7aa7b0 RBP: 00007fff5a7aa7b0 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fff5a7ab840 R13: 00007f87d000e08c R14: 00000000000197d4 R15: 00007fff5a7ab880 Allocated by task 6103: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236 alloc_buffer_head+0x2a/0x270 fs/buffer.c:3025 folio_alloc_buffers+0x32d/0x640 fs/buffer.c:935 grow_dev_folio fs/buffer.c:1075 [inline] grow_buffers fs/buffer.c:1116 [inline] __getblk_slow fs/buffer.c:1134 [inline] bdev_getblk+0x286/0x660 fs/buffer.c:1461 __getblk include/linux/buffer_head.h:380 [inline] do_readahead fs/jbd2/recovery.c:95 [inline] jread+0x452/0xaa0 fs/jbd2/recovery.c:160 do_one_pass+0x3c4/0x2e30 fs/jbd2/recovery.c:673 jbd2_journal_skip_recovery+0x9e/0x200 fs/jbd2/recovery.c:368 jbd2_journal_wipe+0xc6/0x110 fs/jbd2/journal.c:2497 ocfs2_journal_wipe+0xa8/0x250 fs/ocfs2/journal.c:1214 ocfs2_check_volume fs/ocfs2/super.c:2361 [inline] ocfs2_mount_volume fs/ocfs2/super.c:1762 [inline] ocfs2_fill_super+0x49a4/0x63c0 fs/ocfs2/super.c:1083 get_tree_bdev_flags+0x40e/0x4d0 fs/super.c:1692 vfs_get_tree+0x8f/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4321 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 5858: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:243 [inline] __kasan_slab_free+0x5b/0x80 mm/kasan/common.c:275 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2417 [inline] slab_free mm/slub.c:4680 [inline] kmem_cache_free+0x18f/0x400 mm/slub.c:4782 free_buffer_head+0x55/0x220 fs/buffer.c:3041 try_to_free_buffers+0x232/0x2d0 fs/buffer.c:2982 block_invalidate_folio+0x5f7/0x730 fs/buffer.c:1674 folio_invalidate mm/truncate.c:140 [inline] truncate_cleanup_folio+0x2d5/0x430 mm/truncate.c:160 truncate_inode_pages_range+0x233/0xda0 mm/truncate.c:379 kill_bdev block/bdev.c:91 [inline] blkdev_flush_mapping+0x108/0x270 block/bdev.c:712 blkdev_put_whole block/bdev.c:719 [inline] bdev_release+0x417/0x650 block/bdev.c:1144 blkdev_release+0x15/0x20 block/fops.c:699 __fput+0x449/0xa70 fs/file_table.c:468 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888044c8e2b8 which belongs to the cache buffer_head of size 168 The buggy address is located 8 bytes inside of freed 168-byte region [ffff888044c8e2b8, ffff888044c8e360) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff888044c8ebc8 pfn:0x44c8e memcg:ffff8880366cf801 flags: 0x4fff00000000200(workingset|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000200 ffff88801bef0280 ffffea00011324d0 ffffea0001137ed0 raw: ffff888044c8ebc8 0000000000110002 00000000f5000000 ffff8880366cf801 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Reclaimable, gfp_mask 0x52c50(GFP_NOFS|__GFP_RECLAIMABLE|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 5243, tgid 5243 (sftp-server), ts 46051818273, free_ts 0 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1851 prep_new_page mm/page_alloc.c:1859 [inline] get_page_from_freelist+0x21e4/0x22c0 mm/page_alloc.c:3858 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5148 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_slab_page mm/slub.c:2487 [inline] allocate_slab+0x8a/0x370 mm/slub.c:2655 new_slab mm/slub.c:2709 [inline] ___slab_alloc+0xbeb/0x1410 mm/slub.c:3891 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] kmem_cache_alloc_noprof+0x283/0x3c0 mm/slub.c:4236 alloc_buffer_head+0x2a/0x270 fs/buffer.c:3025 folio_alloc_buffers+0x32d/0x640 fs/buffer.c:935 create_empty_buffers+0x3a/0x530 fs/buffer.c:1691 ext4_block_write_begin+0x412/0x1710 fs/ext4/inode.c:1179 ext4_da_write_begin+0x8dc/0xda0 fs/ext4/inode.c:3152 generic_perform_write+0x2c2/0x900 mm/filemap.c:4175 ext4_buffered_write_iter+0xce/0x3a0 fs/ext4/file.c:299 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x5c6/0xb30 fs/read_write.c:686 page_owner free stack trace missing Memory state around the buggy address: ffff888044c8e180: fb fb fc fc fc fc fc fc fc fc fa fb fb fb fb fb ffff888044c8e200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc >ffff888044c8e280: fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb ^ ffff888044c8e300: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888044c8e380: fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb fb ==================================================================