================================================================== BUG: KASAN: slab-use-after-free in dtInsertEntry+0x10f1/0x1770 fs/jfs/jfs_dtree.c:3735 Read of size 4 at addr ffff88803a6d62ac by task syz-executor.1/17087 CPU: 1 PID: 17087 Comm: syz-executor.1 Not tainted 6.8.0-rc1-syzkaller-00356-g8a696a29c690 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x163/0x540 mm/kasan/report.c:488 kasan_report+0x142/0x170 mm/kasan/report.c:601 dtInsertEntry+0x10f1/0x1770 fs/jfs/jfs_dtree.c:3735 dtInsert+0xbf1/0x6b00 fs/jfs/jfs_dtree.c:891 jfs_create+0x7b6/0xb90 fs/jfs/namei.c:137 lookup_open fs/namei.c:3496 [inline] open_last_lookups fs/namei.c:3565 [inline] path_openat+0x13fe/0x31e0 fs/namei.c:3795 do_filp_open+0x234/0x490 fs/namei.c:3825 do_sys_openat2+0x13e/0x1d0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_open fs/open.c:1427 [inline] __se_sys_open fs/open.c:1423 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1423 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fb6f227cda9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb6f2fc50c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fb6f23ac050 RCX: 00007fb6f227cda9 RDX: 0000000000000000 RSI: 0000000000145142 RDI: 0000000020007f80 RBP: 00007fb6f22c947a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fb6f23ac050 R15: 00007ffd0c7ceba8 The buggy address belongs to the object at ffff88803a6d5c80 which belongs to the cache jfs_ip of size 2240 The buggy address is located 1580 bytes inside of freed 2240-byte region [ffff88803a6d5c80, ffff88803a6d6540) The buggy address belongs to the physical page: page:ffffea0000e9b400 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3a6d0 head:ffffea0000e9b400 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff88802a983a01 flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000840 ffff888018f893c0 dead000000000100 dead000000000122 raw: 0000000000000000 00000000800d000d 00000001ffffffff ffff88802a983a01 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Reclaimable, gfp_mask 0x1d2050(__GFP_IO|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL|__GFP_RECLAIMABLE), pid 8019, tgid 8017 (syz-executor.0), ts 292562660256, free_ts 292559618338 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1533 prep_new_page mm/page_alloc.c:1540 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3311 __alloc_pages+0x255/0x680 mm/page_alloc.c:4567 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page+0x5f/0x160 mm/slub.c:2190 allocate_slab mm/slub.c:2354 [inline] new_slab+0x84/0x2f0 mm/slub.c:2407 ___slab_alloc+0xd17/0x13d0 mm/slub.c:3540 __slab_alloc mm/slub.c:3625 [inline] __slab_alloc_node mm/slub.c:3678 [inline] slab_alloc_node mm/slub.c:3850 [inline] kmem_cache_alloc_lru+0x24d/0x340 mm/slub.c:3879 alloc_inode_sb include/linux/fs.h:3019 [inline] jfs_alloc_inode+0x28/0x60 fs/jfs/super.c:105 alloc_inode fs/inode.c:260 [inline] iget_locked+0x1a9/0x830 fs/inode.c:1278 jfs_iget+0x22/0x3b0 fs/jfs/inode.c:29 jfs_fill_super+0x808/0xc50 fs/jfs/super.c:580 mount_bdev+0x206/0x2d0 fs/super.c:1663 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x2a0 fs/super.c:1784 do_new_mount+0x2be/0xb40 fs/namespace.c:3352 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3875 page last free pid 5090 tgid 5090 stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1140 [inline] free_unref_page_prepare+0x959/0xa80 mm/page_alloc.c:2346 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2486 discard_slab mm/slub.c:2453 [inline] __put_partials+0xeb/0x130 mm/slub.c:2922 put_cpu_partial+0x17b/0x250 mm/slub.c:2997 __slab_free+0x2fe/0x410 mm/slub.c:4166 qlink_free mm/kasan/quarantine.c:160 [inline] qlist_free_all+0x6d/0xd0 mm/kasan/quarantine.c:176 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:283 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:324 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x16f/0x340 mm/slub.c:3867 kmem_cache_zalloc include/linux/slab.h:701 [inline] alloc_empty_file+0x9e/0x1d0 fs/file_table.c:203 path_openat+0xfa/0x31e0 fs/namei.c:3784 do_filp_open+0x234/0x490 fs/namei.c:3825 do_sys_openat2+0x13e/0x1d0 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1430 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b Memory state around the buggy address: ffff88803a6d6180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803a6d6200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88803a6d6280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803a6d6300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803a6d6380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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