================================================================== BUG: KASAN: slab-use-after-free in mas_safe_min lib/maple_tree.c:727 [inline] BUG: KASAN: slab-use-after-free in mas_next_nentry lib/maple_tree.c:4664 [inline] BUG: KASAN: slab-use-after-free in mas_next_entry+0x12b3/0x1690 lib/maple_tree.c:4760 Read of size 8 at addr ffff88807d799640 by task syz-executor.2/12028 CPU: 1 PID: 12028 Comm: syz-executor.2 Not tainted 6.3.0-rc5-syzkaller-00137-gf2afccfefe7b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:319 print_report mm/kasan/report.c:430 [inline] kasan_report+0x11c/0x130 mm/kasan/report.c:536 mas_safe_min lib/maple_tree.c:727 [inline] mas_next_nentry lib/maple_tree.c:4664 [inline] mas_next_entry+0x12b3/0x1690 lib/maple_tree.c:4760 mas_find+0x7d/0x200 lib/maple_tree.c:6025 vma_find include/linux/mm.h:736 [inline] __do_sys_set_mempolicy_home_node+0x1ef/0x480 mm/mempolicy.c:1524 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fcc0408c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fcc02bbc168 EFLAGS: 00000246 ORIG_RAX: 00000000000001c2 RAX: ffffffffffffffda RBX: 00007fcc041ac120 RCX: 00007fcc0408c169 RDX: 0000000000000000 RSI: 0000000000003000 RDI: 0000000020ffd000 RBP: 00007fcc040e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcc042cfb1f R14: 00007fcc02bbc300 R15: 0000000000022000 Allocated by task 12024: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 __kasan_slab_alloc+0x7f/0x90 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:769 [inline] kmem_cache_alloc_bulk+0x424/0x860 mm/slub.c:4034 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x276/0x8a0 lib/maple_tree.c:1263 mas_node_count_gfp lib/maple_tree.c:1318 [inline] mas_preallocate+0x1bb/0x360 lib/maple_tree.c:5717 vma_iter_prealloc mm/internal.h:972 [inline] __split_vma+0x1b7/0x810 mm/mmap.c:2177 split_vma+0xc6/0x110 mm/mmap.c:2242 mprotect_fixup+0x7ed/0xa60 mm/mprotect.c:663 do_mprotect_pkey+0x95c/0xbe0 mm/mprotect.c:831 __do_sys_mprotect mm/mprotect.c:852 [inline] __se_sys_mprotect mm/mprotect.c:849 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:849 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 12028: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 kasan_set_track+0x25/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:521 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1781 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807 slab_free mm/slub.c:3787 [inline] kmem_cache_free_bulk.part.0+0x20c/0x680 mm/slub.c:3905 mt_free_bulk lib/maple_tree.c:169 [inline] mas_destroy+0x3e0/0x650 lib/maple_tree.c:5771 mas_store_prealloc+0xf0/0x150 lib/maple_tree.c:5702 vma_iter_store mm/internal.h:1013 [inline] vma_complete+0xad9/0x1170 mm/mmap.c:572 __split_vma+0x523/0x810 mm/mmap.c:2214 split_vma+0xc6/0x110 mm/mmap.c:2242 mbind_range+0x4d2/0x760 mm/mempolicy.c:829 __do_sys_set_mempolicy_home_node+0x323/0x480 mm/mempolicy.c:1546 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807d799600 which belongs to the cache maple_node of size 256 The buggy address is located 64 bytes inside of freed 256-byte region [ffff88807d799600, ffff88807d799700) The buggy address belongs to the physical page: page:ffffea0001f5e600 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d798 head:ffffea0001f5e600 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffff8880124cd000 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 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 12024, tgid 12024 (syz-executor.2), ts 410270838471, free_ts 407924502117 prep_new_page mm/page_alloc.c:2553 [inline] get_page_from_freelist+0x1190/0x2e20 mm/page_alloc.c:4326 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:5592 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2283 alloc_slab_page mm/slub.c:1851 [inline] allocate_slab+0x25f/0x390 mm/slub.c:1998 new_slab mm/slub.c:2051 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3193 __kmem_cache_alloc_bulk mm/slub.c:3952 [inline] kmem_cache_alloc_bulk+0x270/0x860 mm/slub.c:4027 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x276/0x8a0 lib/maple_tree.c:1263 mas_node_count_gfp lib/maple_tree.c:1318 [inline] mas_preallocate+0x1bb/0x360 lib/maple_tree.c:5717 vma_iter_prealloc mm/internal.h:972 [inline] __split_vma+0x1b7/0x810 mm/mmap.c:2177 split_vma+0xc6/0x110 mm/mmap.c:2242 mprotect_fixup+0x771/0xa60 mm/mprotect.c:657 do_mprotect_pkey+0x95c/0xbe0 mm/mprotect.c:831 __do_sys_mprotect mm/mprotect.c:852 [inline] __se_sys_mprotect mm/mprotect.c:849 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:849 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1454 [inline] free_pcp_prepare+0x5d5/0xa50 mm/page_alloc.c:1504 free_unref_page_prepare mm/page_alloc.c:3388 [inline] free_unref_page+0x1d/0x490 mm/page_alloc.c:3483 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2637 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook mm/slab.h:769 [inline] slab_alloc_node mm/slub.c:3452 [inline] __kmem_cache_alloc_node+0x17c/0x320 mm/slub.c:3491 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1061 kmalloc include/linux/slab.h:580 [inline] kzalloc include/linux/slab.h:720 [inline] kernfs_fop_open+0x31e/0xe70 fs/kernfs/file.c:670 do_dentry_open+0x6cc/0x13f0 fs/open.c:920 do_open fs/namei.c:3560 [inline] path_openat+0x1baa/0x2750 fs/namei.c:3715 do_filp_open+0x1ba/0x410 fs/namei.c:3742 do_sys_openat2+0x16d/0x4c0 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0x143/0x1f0 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88807d799500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d799580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807d799600: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d799680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d799700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================