================================================================== BUG: KASAN: use-after-free in hfsplus_release_folio+0x497/0x560 fs/hfsplus/inode.c:92 Read of size 4 at addr ffff888032304038 by task syz-executor.0/5215 CPU: 0 PID: 5215 Comm: syz-executor.0 Not tainted 6.2.0-rc2-syzkaller-00256-ga689b938df39 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:306 print_report+0x107/0x220 mm/kasan/report.c:417 kasan_report+0x139/0x170 mm/kasan/report.c:517 hfsplus_release_folio+0x497/0x560 fs/hfsplus/inode.c:92 block_invalidate_folio+0x661/0xa60 fs/buffer.c:1526 folio_invalidate mm/truncate.c:159 [inline] truncate_cleanup_folio+0x289/0x7b0 mm/truncate.c:179 truncate_inode_pages_range+0x2c8/0x1650 mm/truncate.c:368 hfsplus_evict_inode+0x25/0xf0 fs/hfsplus/super.c:168 evict+0x2a4/0x620 fs/inode.c:664 hfsplus_put_super+0x207/0x320 fs/hfsplus/super.c:302 generic_shutdown_super+0x130/0x310 fs/super.c:492 kill_block_super+0x79/0xd0 fs/super.c:1386 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 cleanup_mnt+0x494/0x520 fs/namespace.c:1291 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fdf81a8d537 Code: ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 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 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffee6abf898 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fdf81a8d537 RDX: 00007ffee6abf96b RSI: 000000000000000a RDI: 00007ffee6abf960 RBP: 00007ffee6abf960 R08: 00000000ffffffff R09: 00007ffee6abf730 R10: 0000555555bc68b3 R11: 0000000000000246 R12: 00007fdf81ae6b24 R13: 00007ffee6ac0a20 R14: 0000555555bc6810 R15: 00007ffee6ac0a60 Allocated by task 19201: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 mm/kasan/common.c:380 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] hfsplus_btree_open+0x5a/0xd00 fs/hfsplus/btree.c:142 hfsplus_fill_super+0xaa2/0x1c60 fs/hfsplus/super.c:473 mount_bdev+0x26c/0x3a0 fs/super.c:1359 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 5215: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:518 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3800 hfsplus_put_super+0x1c7/0x320 fs/hfsplus/super.c:300 generic_shutdown_super+0x130/0x310 fs/super.c:492 kill_block_super+0x79/0xd0 fs/super.c:1386 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 cleanup_mnt+0x494/0x520 fs/namespace.c:1291 task_work_run+0x243/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0x134/0x160 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xad/0x110 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x2e/0x60 kernel/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff888032304000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 56 bytes inside of 4096-byte region [ffff888032304000, ffff888032305000) The buggy address belongs to the physical page: page:ffffea0000c8c000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x32300 head:ffffea0000c8c000 order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff888012842140 ffffea000113b000 dead000000000002 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 7920, tgid 7919 (syz-executor.5), ts 2443231676804, free_ts 2414595500470 prep_new_page mm/page_alloc.c:2531 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0xbd/0x190 mm/slub.c:1851 allocate_slab+0x5e/0x3c0 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3193 __slab_alloc mm/slub.c:3292 [inline] __slab_alloc_node mm/slub.c:3345 [inline] slab_alloc_node mm/slub.c:3442 [inline] __kmem_cache_alloc_node+0x25b/0x340 mm/slub.c:3491 __do_kmalloc_node mm/slab_common.c:967 [inline] __kmalloc_node+0x9e/0x190 mm/slab_common.c:975 kmalloc_node include/linux/slab.h:610 [inline] kvmalloc_node+0x6e/0x180 mm/util.c:581 kvmalloc include/linux/slab.h:737 [inline] kvzalloc include/linux/slab.h:745 [inline] bucket_table_alloc lib/rhashtable.c:184 [inline] rhashtable_init+0x57b/0xac0 lib/rhashtable.c:1065 tipc_init_net+0x22b/0x320 net/tipc/core.c:76 ops_init+0x353/0x5d0 net/core/net_namespace.c:135 setup_net+0x60b/0xd80 net/core/net_namespace.c:333 copy_net_ns+0x34c/0x5a0 net/core/net_namespace.c:483 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110 copy_namespaces+0x34b/0x3c0 kernel/nsproxy.c:179 copy_process+0x1937/0x3ec0 kernel/fork.c:2269 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1446 [inline] free_pcp_prepare+0x751/0x780 mm/page_alloc.c:1496 free_unref_page_prepare mm/page_alloc.c:3369 [inline] free_unref_page+0x19/0x4c0 mm/page_alloc.c:3464 discard_slab mm/slub.c:2098 [inline] __unfreeze_partials+0x1a5/0x1e0 mm/slub.c:2637 put_cpu_partial+0x116/0x180 mm/slub.c:2713 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x156/0x170 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:761 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x1e0/0x340 mm/slub.c:3491 kmalloc_trace+0x26/0x60 mm/slab_common.c:1062 kmalloc include/linux/slab.h:580 [inline] gro_cells_destroy+0x348/0x3f0 net/core/gro_cells.c:125 ip6gre_dev_free+0x15/0x50 net/ipv6/ip6_gre.c:1425 netdev_run_todo+0xecc/0x1090 net/core/dev.c:10352 ip6gre_exit_batch_net+0x45a/0x4a0 net/ipv6/ip6_gre.c:1640 ops_exit_list net/core/net_namespace.c:174 [inline] setup_net+0xa9b/0xd80 net/core/net_namespace.c:356 copy_net_ns+0x34c/0x5a0 net/core/net_namespace.c:483 create_new_namespaces+0x4db/0x8e0 kernel/nsproxy.c:110 Memory state around the buggy address: ffff888032303f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888032303f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888032304000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888032304080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888032304100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================