================================================================== BUG: KASAN: slab-out-of-bounds in jfs_readdir+0x1df9/0x4010 fs/jfs/jfs_dtree.c:2919 Read of size 4 at addr ffff88807b7bf76c by task syz.6.249/8128 CPU: 1 UID: 0 PID: 8128 Comm: syz.6.249 Not tainted 6.15.0-rc2-syzkaller-00488-g6fea5fabd332 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0x16e/0x5b0 mm/kasan/report.c:521 kasan_report+0x143/0x180 mm/kasan/report.c:634 jfs_readdir+0x1df9/0x4010 fs/jfs/jfs_dtree.c:2919 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x5a9/0x760 fs/readdir.c:108 __do_sys_getdents64 fs/readdir.c:403 [inline] __se_sys_getdents64+0x1e4/0x4c0 fs/readdir.c:389 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f34b778e169 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:00007f34b85b1038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f34b79b5fa0 RCX: 00007f34b778e169 RDX: 0000000000000055 RSI: 00002000000000c0 RDI: 0000000000000006 RBP: 00007f34b7810a68 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f34b79b5fa0 R15: 00007ffdbe6f92e8 Allocated by task 8128: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_lru_noprof+0x1e5/0x390 mm/slub.c:4229 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x69/0x1b0 fs/inode.c:346 iget_locked+0xf1/0x570 fs/inode.c:1439 jfs_iget+0x23/0x3e0 fs/jfs/inode.c:29 jfs_lookup+0x239/0x440 fs/jfs/namei.c:1469 __lookup_slow+0x2b1/0x400 fs/namei.c:1817 lookup_slow+0x53/0x70 fs/namei.c:1834 walk_component fs/namei.c:2138 [inline] link_path_walk+0x969/0xeb0 fs/namei.c:2503 path_parentat fs/namei.c:2707 [inline] __filename_parentat+0x2b9/0x780 fs/namei.c:2731 filename_parentat fs/namei.c:2749 [inline] do_renameat2+0x3d6/0x1410 fs/namei.c:5193 __do_sys_renameat2 fs/namei.c:5304 [inline] __se_sys_renameat2 fs/namei.c:5301 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5301 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff88807b7beea0 which belongs to the cache jfs_ip of size 2232 The buggy address is located 20 bytes to the right of allocated 2232-byte region [ffff88807b7beea0, ffff88807b7bf758) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7b7b8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888029713001 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888146ad0b40 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff888029713001 head: 00fff00000000040 ffff888146ad0b40 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff888029713001 head: 00fff00000000003 ffffea0001edee01 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0xd2050(__GFP_RECLAIMABLE|__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 6203, tgid 6202 (syz.4.47), ts 95213492954, free_ts 88255415365 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1718 prep_new_page mm/page_alloc.c:1726 [inline] get_page_from_freelist+0x360d/0x37b0 mm/page_alloc.c:3688 __alloc_frozen_pages_noprof+0x211/0x5b0 mm/page_alloc.c:4970 alloc_pages_mpol+0x339/0x690 mm/mempolicy.c:2301 alloc_slab_page mm/slub.c:2468 [inline] allocate_slab+0x8f/0x3b0 mm/slub.c:2632 new_slab mm/slub.c:2686 [inline] ___slab_alloc+0xc3b/0x1500 mm/slub.c:3872 __slab_alloc+0x58/0xa0 mm/slub.c:3962 __slab_alloc_node mm/slub.c:4037 [inline] slab_alloc_node mm/slub.c:4198 [inline] kmem_cache_alloc_lru_noprof+0x274/0x390 mm/slub.c:4229 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x69/0x1b0 fs/inode.c:346 new_inode+0x22/0x180 fs/inode.c:1145 jfs_fill_super+0x570/0xd90 fs/jfs/super.c:511 get_tree_bdev_flags+0x490/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 do_new_mount+0x2cf/0xb70 fs/namespace.c:3881 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount+0x38c/0x400 fs/namespace.c:4409 page last free pid 5824 tgid 5824 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1262 [inline] __free_frozen_pages+0xddf/0x10a0 mm/page_alloc.c:2725 __folio_put+0x2b5/0x360 mm/swap.c:112 folio_put include/linux/mm.h:1580 [inline] free_large_kmalloc+0x143/0x1e0 mm/slub.c:4781 kfree+0x216/0x430 mm/slub.c:4849 btree_bounce_free fs/bcachefs/btree_io.c:112 [inline] btree_node_sort+0x1124/0x1870 fs/bcachefs/btree_io.c:380 bch2_btree_post_write_cleanup+0x11a/0xaa0 fs/bcachefs/btree_io.c:2508 bch2_btree_node_prep_for_write+0x35a/0x670 fs/bcachefs/btree_trans_commit.c:93 bch2_trans_lock_write+0x66f/0xb60 fs/bcachefs/btree_trans_commit.c:129 do_bch2_trans_commit fs/bcachefs/btree_trans_commit.c:840 [inline] __bch2_trans_commit+0x3252/0x9da0 fs/bcachefs/btree_trans_commit.c:1050 bch2_trans_commit fs/bcachefs/btree_update.h:195 [inline] btree_key_cache_flush_pos fs/bcachefs/btree_key_cache.c:465 [inline] bch2_btree_key_cache_journal_flush+0x9c8/0xee0 fs/bcachefs/btree_key_cache.c:545 journal_flush_pins+0x89b/0xe40 fs/bcachefs/journal_reclaim.c:589 journal_flush_pins_or_still_flushing fs/bcachefs/journal_reclaim.c:859 [inline] journal_flush_done+0x107/0x820 fs/bcachefs/journal_reclaim.c:877 bch2_journal_flush_pins+0x109/0x3c0 fs/bcachefs/journal_reclaim.c:909 bch2_journal_flush_all_pins fs/bcachefs/journal_reclaim.h:76 [inline] __bch2_fs_read_only+0x13a/0x4b0 fs/bcachefs/super.c:270 bch2_fs_read_only+0xd16/0x1400 fs/bcachefs/super.c:352 __bch2_fs_stop+0x107/0x5b0 fs/bcachefs/super.c:638 Memory state around the buggy address: ffff88807b7bf600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807b7bf680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807b7bf700: 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc ^ ffff88807b7bf780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807b7bf800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================