================================================================== BUG: KASAN: use-after-free in ma_dead_node lib/maple_tree.c:532 [inline] BUG: KASAN: use-after-free in mas_next_entry lib/maple_tree.c:4637 [inline] BUG: KASAN: use-after-free in mas_find+0xada/0xce0 lib/maple_tree.c:5872 Read of size 8 at addr ffff88802a139a00 by task syz-executor.0/11357 CPU: 0 PID: 11357 Comm: syz-executor.0 Not tainted 5.19.0-rc2-next-20220614-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 ma_dead_node lib/maple_tree.c:532 [inline] mas_next_entry lib/maple_tree.c:4637 [inline] mas_find+0xada/0xce0 lib/maple_tree.c:5872 userfaultfd_release+0x239/0x670 fs/userfaultfd.c:875 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7fd4da43bd4b Code: 0f 05 48 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8 63 fc ff ff 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 a1 fc ff ff 8b 44 RSP: 002b:00007fff9e2b8740 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007fd4da43bd4b RDX: 0000001b2e920000 RSI: 0000001b2e922554 RDI: 0000000000000003 RBP: 00007fd4da59d960 R08: 0000000000000000 R09: 00000000ad88641e R10: 00007fff9e3d9090 R11: 0000000000000293 R12: 000000000015ee1a R13: 00007fff9e2b8840 R14: 00007fd4da59c100 R15: 0000000000000032 Allocated by task 11364: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] kmem_cache_alloc_bulk+0x39f/0x720 mm/slub.c:3728 mt_alloc_bulk lib/maple_tree.c:151 [inline] mas_alloc_nodes+0x2b0/0x6b0 lib/maple_tree.c:1244 mas_preallocate+0xfb/0x270 lib/maple_tree.c:5584 __vma_adjust+0x226/0x1900 mm/mmap.c:762 vma_adjust include/linux/mm.h:2659 [inline] __split_vma+0x295/0x530 mm/mmap.c:2302 do_mas_align_munmap+0x2c0/0xf00 mm/mmap.c:2399 do_mas_munmap+0x202/0x2c0 mm/mmap.c:2556 do_munmap+0xc3/0x100 mm/mmap.c:2570 move_vma+0x776/0xf60 mm/mremap.c:703 __do_sys_mremap+0x48a/0x16b0 mm/mremap.c:1075 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 11357: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kmem_cache_free_bulk mm/slub.c:3654 [inline] kmem_cache_free_bulk+0x2c0/0xb60 mm/slub.c:3641 mt_free_bulk lib/maple_tree.c:157 [inline] mas_destroy+0x394/0x5c0 lib/maple_tree.c:5688 mas_store_prealloc+0xec/0x150 lib/maple_tree.c:5569 __vma_adjust+0x6d7/0x1900 mm/mmap.c:832 vma_merge+0x6a8/0x870 mm/mmap.c:1132 userfaultfd_release+0x4c5/0x670 fs/userfaultfd.c:884 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88802a139a00 which belongs to the cache maple_node of size 256 The buggy address is located 0 bytes inside of 256-byte region [ffff88802a139a00, ffff88802a139b00) The buggy address belongs to the physical page: page:ffffea0000a84e00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2a138 head:ffffea0000a84e00 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000122 ffff88801184fdc0 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 11364, tgid 11357 (syz-executor.0), ts 1436469706949, free_ts 1436430476214 prep_new_page mm/page_alloc.c:2525 [inline] get_page_from_freelist+0x1efe/0x3a20 mm/page_alloc.c:4296 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5512 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 kmem_cache_alloc_bulk+0x21c/0x720 mm/slub.c:3704 mt_alloc_bulk lib/maple_tree.c:151 [inline] mas_alloc_nodes+0x2b0/0x6b0 lib/maple_tree.c:1244 mas_preallocate+0xfb/0x270 lib/maple_tree.c:5584 do_mas_align_munmap+0x148/0xf00 mm/mmap.c:2369 do_mas_munmap+0x202/0x2c0 mm/mmap.c:2556 do_munmap+0xc3/0x100 mm/mmap.c:2570 move_vma+0x776/0xf60 mm/mremap.c:703 __do_sys_mremap+0x48a/0x16b0 mm/mremap.c:1075 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1443 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1493 free_unref_page_prepare mm/page_alloc.c:3373 [inline] free_unref_page+0x19/0x560 mm/page_alloc.c:3470 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x204/0x3b0 mm/slub.c:3239 getname_flags.part.0+0x50/0x4f0 fs/namei.c:139 getname_flags+0x9a/0xe0 include/linux/audit.h:321 getname fs/namei.c:218 [inline] __do_sys_symlinkat fs/namei.c:4387 [inline] __se_sys_symlinkat fs/namei.c:4384 [inline] __x64_sys_symlinkat+0x77/0xc0 fs/namei.c:4384 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88802a139900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802a139980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802a139a00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802a139a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802a139b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================