================================================================== BUG: KASAN: slab-out-of-bounds in addressPXD fs/jfs/jfs_types.h:80 [inline] BUG: KASAN: slab-out-of-bounds in dtReadFirst+0x512/0xc50 fs/jfs/jfs_dtree.c:3107 Read of size 4 at addr ffff8880594ebe28 by task syz.0.1/5909 CPU: 0 UID: 0 PID: 5909 Comm: syz.0.1 Not tainted 6.14.0-rc4-syzkaller #0 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 addressPXD fs/jfs/jfs_types.h:80 [inline] dtReadFirst+0x512/0xc50 fs/jfs/jfs_dtree.c:3107 jfs_readdir+0x87a/0x3cb0 fs/jfs/jfs_dtree.c:2820 wrap_directory_iterator+0x91/0xd0 fs/readdir.c:65 iterate_dir+0x5a9/0x760 fs/readdir.c:108 get_name fs/exportfs/expfs.c:325 [inline] exportfs_get_name+0x5b7/0x720 fs/exportfs/expfs.c:36 reconnect_one fs/exportfs/expfs.c:142 [inline] reconnect_path+0x267/0x750 fs/exportfs/expfs.c:222 exportfs_decode_fh_raw+0x314/0x730 fs/exportfs/expfs.c:485 do_handle_to_path+0xba/0x1b0 fs/fhandle.c:257 handle_to_path fs/fhandle.c:385 [inline] do_handle_open+0x88d/0xb00 fs/fhandle.c:403 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8fae98d169 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:00007f8faf8b2038 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007f8faeba5fa0 RCX: 00007f8fae98d169 RDX: 0000000000000000 RSI: 0000400000000080 RDI: 0000000000000005 RBP: 00007f8faea0e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8faeba5fa0 R15: 00007ffdb017d268 The buggy address belongs to the object at ffff8880594eb750 which belongs to the cache jfs_ip of size 2232 The buggy address is located 1752 bytes inside of allocated 2232-byte region [ffff8880594eb750, ffff8880594ec008) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x594e8 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff888026690c01 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000040 ffff88801f3913c0 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800d000d 00000000f5000000 ffff888026690c01 head: 00fff00000000040 ffff88801f3913c0 dead000000000122 0000000000000000 head: 0000000000000000 00000000800d000d 00000000f5000000 ffff888026690c01 head: 00fff00000000003 ffffea0001653a01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 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_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_RECLAIMABLE), pid 5909, tgid 5908 (syz.0.1), ts 81121359061, free_ts 25786288389 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1f4/0x240 mm/page_alloc.c:1551 prep_new_page mm/page_alloc.c:1559 [inline] get_page_from_freelist+0x3651/0x37a0 mm/page_alloc.c:3477 __alloc_frozen_pages_noprof+0x292/0x710 mm/page_alloc.c:4739 alloc_pages_mpol+0x311/0x660 mm/mempolicy.c:2270 alloc_slab_page mm/slub.c:2423 [inline] allocate_slab+0x8f/0x3a0 mm/slub.c:2587 new_slab mm/slub.c:2640 [inline] ___slab_alloc+0xc27/0x14a0 mm/slub.c:3826 __slab_alloc+0x58/0xa0 mm/slub.c:3916 __slab_alloc_node mm/slub.c:3991 [inline] slab_alloc_node mm/slub.c:4152 [inline] kmem_cache_alloc_lru_noprof+0x26c/0x390 mm/slub.c:4183 jfs_alloc_inode+0x28/0x70 fs/jfs/super.c:105 alloc_inode+0x65/0x1a0 fs/inode.c:336 new_inode_pseudo fs/inode.c:1174 [inline] new_inode+0x22/0x1d0 fs/inode.c:1193 jfs_fill_super+0x570/0xd90 fs/jfs/super.c:511 get_tree_bdev_flags+0x48c/0x5c0 fs/super.c:1636 vfs_get_tree+0x90/0x2b0 fs/super.c:1814 do_new_mount+0x2be/0xb40 fs/namespace.c:3560 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088 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:1127 [inline] free_frozen_pages+0xe04/0x10e0 mm/page_alloc.c:2660 free_contig_range+0x14c/0x430 mm/page_alloc.c:6678 destroy_args+0x94/0x4b0 mm/debug_vm_pgtable.c:1017 debug_vm_pgtable+0x551/0x590 mm/debug_vm_pgtable.c:1397 do_one_initcall+0x248/0x930 init/main.c:1257 do_initcall_level+0x157/0x210 init/main.c:1319 do_initcalls+0x71/0xd0 init/main.c:1335 kernel_init_freeable+0x435/0x5d0 init/main.c:1568 kernel_init+0x1d/0x2b0 init/main.c:1457 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Memory state around the buggy address: ffff8880594ebd00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880594ebd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880594ebe00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880594ebe80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880594ebf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================