================================================================== BUG: KASAN: slab-out-of-bounds in jfs_readdir+0x1df9/0x4010 fs/jfs/jfs_dtree.c:2919 Read of size 4 at addr ffff88805ba136e4 by task syz.1.2/5927 CPU: 1 UID: 0 PID: 5927 Comm: syz.1.2 Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #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: 0033:0x7f0682d8e969 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:00007f0683ba8038 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f0682fb6080 RCX: 00007f0682d8e969 RDX: 0000000000001000 RSI: 0000200000000f80 RDI: 0000000000000006 RBP: 00007f0682e10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0682fb6080 R15: 00007fff72c39398 Allocated by task 5917: 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 ffff88805ba12e18 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 [ffff88805ba12e18, ffff88805ba136d0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5ba10 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888032de7d01 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff888143ad5dc0 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff888032de7d01 head: 00fff00000000040 ffff888143ad5dc0 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff888032de7d01 head: 00fff00000000003 ffffea00016e8401 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 5917, tgid 5916 (syz.1.2), ts 95806900972, free_ts 30051497588 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 diReadSpecial+0x52/0x720 fs/jfs/jfs_imap.c:426 jfs_mount+0x75/0x830 fs/jfs/jfs_mount.c:87 jfs_fill_super+0x6b9/0xd90 fs/jfs/super.c:523 get_tree_bdev_flags+0x490/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1759 page last free pid 1 tgid 1 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 __free_pages mm/page_alloc.c:5080 [inline] free_contig_range+0x154/0x430 mm/page_alloc.c:6936 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x555/0x590 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x24a/0x940 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x71/0xd0 init/main.c:1335 kernel_init_freeable+0x432/0x5d0 init/main.c:1567 kernel_init+0x1d/0x2b0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Memory state around the buggy address: ffff88805ba13580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88805ba13600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88805ba13680: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc ^ ffff88805ba13700: fc fc fc fc fc fc fc fc fc fc 00 00 00 00 00 00 ffff88805ba13780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================