================================================================== BUG: KASAN: slab-use-after-free in mt_slot lib/maple_tree.c:816 [inline] BUG: KASAN: slab-use-after-free in mas_next_slot+0x491/0x960 lib/maple_tree.c:4768 Read of size 8 at addr ffff88801f15aa90 by task syz-executor.2/6836 CPU: 1 PID: 6836 Comm: syz-executor.2 Not tainted 6.4.0-syzkaller-10096-gdfab92f27c60 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 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:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x175/0x1b0 mm/kasan/report.c:588 mt_slot lib/maple_tree.c:816 [inline] mas_next_slot+0x491/0x960 lib/maple_tree.c:4768 vma_next include/linux/mm.h:865 [inline] validate_mm+0x3e5/0x500 mm/mmap.c:301 do_vmi_align_munmap+0x13b1/0x15c0 mm/mmap.c:2561 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2619 __vm_munmap+0x230/0x450 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x69/0x80 mm/mmap.c:2913 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f33f568c467 Code: 00 00 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb 85 66 2e 0f 1f 84 00 00 00 00 00 90 b8 0b 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:00007f33f6346f38 EFLAGS: 00000213 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f33f568c467 RDX: 0000000000000000 RSI: 0000000008400000 RDI: 00007f33ebdff000 RBP: 00007f33ebdff000 R08: 0000000000000423 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000000002 R13: 00007f33f6346fdc R14: 00007f33f6346fe0 R15: 00000000200004c2 Allocated by task 6836: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x66/0x70 mm/kasan/common.c:328 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:750 slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x123/0x300 mm/slub.c:3494 mt_alloc_one lib/maple_tree.c:159 [inline] mas_alloc_nodes+0x276/0x800 lib/maple_tree.c:1282 mas_node_count_gfp lib/maple_tree.c:1362 [inline] mas_node_count lib/maple_tree.c:1376 [inline] mas_wr_node_store lib/maple_tree.c:4100 [inline] mas_wr_modify+0x1346/0x2290 lib/maple_tree.c:4346 mas_store_gfp+0x30d/0x410 lib/maple_tree.c:5506 vma_iter_clear_gfp mm/mmap.c:162 [inline] do_vmi_align_munmap+0xfad/0x15c0 mm/mmap.c:2538 do_vmi_munmap+0x24d/0x2d0 mm/mmap.c:2619 __vm_munmap+0x230/0x450 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x69/0x80 mm/mmap.c:2913 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 21: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4f/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:521 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:162 [inline] slab_free_hook mm/slub.c:1792 [inline] slab_free_freelist_hook mm/slub.c:1818 [inline] slab_free mm/slub.c:3801 [inline] kmem_cache_free+0x292/0x500 mm/slub.c:3823 rcu_do_batch kernel/rcu/tree.c:2135 [inline] rcu_core+0xaaa/0x1740 kernel/rcu/tree.c:2399 __do_softirq+0x2ab/0x908 kernel/softirq.c:553 Last potentially related work creation: kasan_save_stack+0x3f/0x60 mm/kasan/common.c:45 __kasan_record_aux_stack+0xad/0xc0 mm/kasan/generic.c:491 __call_rcu_common kernel/rcu/tree.c:2649 [inline] call_rcu+0x167/0xa70 kernel/rcu/tree.c:2763 mas_wr_node_store lib/maple_tree.c:4151 [inline] mas_wr_modify+0x1aec/0x2290 lib/maple_tree.c:4346 mas_store_prealloc+0x313/0x650 lib/maple_tree.c:5529 vma_complete+0x1ec/0xb40 mm/mmap.c:553 __split_vma+0x764/0x7f0 mm/mmap.c:2381 mprotect_fixup+0x52e/0xa50 mm/mprotect.c:643 do_mprotect_pkey+0x8b3/0xd90 mm/mprotect.c:817 __do_sys_mprotect mm/mprotect.c:838 [inline] __se_sys_mprotect mm/mprotect.c:835 [inline] __x64_sys_mprotect+0x80/0x90 mm/mprotect.c:835 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88801f15aa00 which belongs to the cache maple_node of size 256 The buggy address is located 144 bytes inside of freed 256-byte region [ffff88801f15aa00, ffff88801f15ab00) The buggy address belongs to the physical page: page:ffffea00007c5680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1f15a head:ffffea00007c5680 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000010200 ffff88801324d000 dead000000000122 0000000000000000 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 6836, tgid 6833 (syz-executor.2), ts 286454109911, free_ts 285957977739 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477 alloc_slab_page+0x6a/0x160 mm/slub.c:1862 allocate_slab mm/slub.c:2009 [inline] new_slab+0x84/0x2f0 mm/slub.c:2062 ___slab_alloc+0xade/0x1100 mm/slub.c:3215 __kmem_cache_alloc_bulk mm/slub.c:3966 [inline] kmem_cache_alloc_bulk+0x196/0x4b0 mm/slub.c:4041 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x3df/0x800 lib/maple_tree.c:1304 mas_node_count_gfp lib/maple_tree.c:1362 [inline] mas_preallocate+0x131/0x350 lib/maple_tree.c:5546 vma_iter_prealloc mm/internal.h:1032 [inline] mmap_region+0x13b1/0x2310 mm/mmap.c:2805 do_mmap+0x8cf/0xf80 mm/mmap.c:1362 vm_mmap_pgoff+0x1db/0x410 mm/util.c:543 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 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:1161 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2348 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2443 __slab_free+0x2f6/0x390 mm/slub.c:3707 qlist_free_all+0x22/0x60 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x14b/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x23/0x70 mm/kasan/common.c:305 kasan_slab_alloc include/linux/kasan.h:186 [inline] slab_post_alloc_hook+0x68/0x3a0 mm/slab.h:750 slab_alloc_node mm/slub.c:3470 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x123/0x300 mm/slub.c:3494 getname_flags+0xbc/0x4e0 fs/namei.c:140 vfs_fstatat fs/stat.c:275 [inline] __do_sys_newfstatat fs/stat.c:446 [inline] __se_sys_newfstatat fs/stat.c:440 [inline] __x64_sys_newfstatat+0x12e/0x1d0 fs/stat.c:440 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88801f15a980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801f15aa00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801f15aa80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801f15ab00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801f15ab80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================