R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007feca86cfb1f R14: 00007feca9197300 R15: 0000000000022000 ================================================================== BUG: KASAN: slab-out-of-bounds in mt_slot lib/maple_tree.c:816 [inline] BUG: KASAN: slab-out-of-bounds in mas_slot lib/maple_tree.c:849 [inline] BUG: KASAN: slab-out-of-bounds in mt_validate_nulls+0xc04/0xd10 lib/maple_tree.c:7172 Read of size 8 at addr ffff888075091100 by task syz-executor.3/11924 CPU: 1 PID: 11924 Comm: syz-executor.3 Not tainted 6.4.0-syzkaller-10173-ga901a3568fd2 #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+0xd9/0x150 lib/dump_stack.c:106 print_address_description.constprop.0+0x2c/0x3c0 mm/kasan/report.c:364 print_report mm/kasan/report.c:475 [inline] kasan_report+0x11d/0x130 mm/kasan/report.c:588 mt_slot lib/maple_tree.c:816 [inline] mas_slot lib/maple_tree.c:849 [inline] mt_validate_nulls+0xc04/0xd10 lib/maple_tree.c:7172 mt_validate+0x17e3/0x4370 lib/maple_tree.c:7227 validate_mm+0x9d/0x470 mm/mmap.c:300 do_vmi_align_munmap+0x1199/0x1680 mm/mmap.c:2561 do_vmi_munmap+0x266/0x430 mm/mmap.c:2619 __do_sys_mremap+0x374/0x17c0 mm/mremap.c:1011 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: 0033:0x7feca848c389 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:00007feca9197168 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007feca85abf80 RCX: 00007feca848c389 RDX: 0000000000001000 RSI: 0000000000003000 RDI: 0000000020dc7000 RBP: 00007feca84d7493 R08: 0000000020ff1000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007feca86cfb1f R14: 00007feca9197300 R15: 0000000000022000 Allocated by task 11922: 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:750 [inline] kmem_cache_alloc_bulk+0x424/0x860 mm/slub.c:4048 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x341/0x8b0 lib/maple_tree.c:1304 mas_node_count_gfp lib/maple_tree.c:1362 [inline] mas_preallocate+0x1bb/0x360 lib/maple_tree.c:5546 vma_iter_prealloc mm/internal.h:1032 [inline] __split_vma+0x1b7/0x830 mm/mmap.c:2344 split_vma+0xc6/0x110 mm/mmap.c:2409 mprotect_fixup+0x90e/0xbd0 mm/mprotect.c:649 do_mprotect_pkey+0x883/0xd40 mm/mprotect.c:817 __do_sys_mprotect mm/mprotect.c:838 [inline] __se_sys_mprotect mm/mprotect.c:835 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:835 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 Last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb9/0xd0 mm/kasan/generic.c:491 __call_rcu_common.constprop.0+0x99/0x7e0 kernel/rcu/tree.c:2649 ma_free_rcu lib/maple_tree.c:189 [inline] mas_free lib/maple_tree.c:1344 [inline] mas_replace+0x98c/0xfa0 lib/maple_tree.c:1785 mas_wr_node_store+0xcab/0x1170 lib/maple_tree.c:4151 mas_wr_modify+0x28b/0x10d0 lib/maple_tree.c:4346 mas_wr_store_entry.isra.0+0x495/0x1030 lib/maple_tree.c:4390 mas_store_prealloc+0xb3/0x270 lib/maple_tree.c:5529 vma_complete+0x8fd/0xdc0 mm/mmap.c:553 __split_vma+0x53b/0x830 mm/mmap.c:2381 split_vma+0xc6/0x110 mm/mmap.c:2409 mprotect_fixup+0x891/0xbd0 mm/mprotect.c:643 do_mprotect_pkey+0x883/0xd40 mm/mprotect.c:817 __do_sys_mprotect mm/mprotect.c:838 [inline] __se_sys_mprotect mm/mprotect.c:835 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:835 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 Second to last potentially related work creation: kasan_save_stack+0x22/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xb9/0xd0 mm/kasan/generic.c:491 __call_rcu_common.constprop.0+0x99/0x7e0 kernel/rcu/tree.c:2649 ma_free_rcu lib/maple_tree.c:189 [inline] mas_free lib/maple_tree.c:1344 [inline] mas_mat_free+0xa0/0x560 lib/maple_tree.c:1021 mas_wmb_replace lib/maple_tree.c:2801 [inline] mas_split.isra.0+0x1203/0x1810 lib/maple_tree.c:3587 mas_commit_b_node.isra.0+0x684/0xcf0 lib/maple_tree.c:3638 mas_wr_bnode+0x155/0x1e0 lib/maple_tree.c:4315 mas_wr_modify+0x2ee/0x10d0 lib/maple_tree.c:4353 mas_wr_store_entry.isra.0+0x495/0x1030 lib/maple_tree.c:4390 mas_store_prealloc+0xb3/0x270 lib/maple_tree.c:5529 mmap_region+0x91c/0x2570 mm/mmap.c:2811 do_mmap+0x850/0xee0 mm/mmap.c:1362 vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543 ksys_mmap_pgoff+0x7d/0x5b0 mm/mmap.c:1408 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 ffff888075091000 which belongs to the cache maple_node of size 256 The buggy address is located 0 bytes to the right of allocated 256-byte region [ffff888075091000, ffff888075091100) The buggy address belongs to the physical page: page:ffffea0001d42400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888075091a00 pfn:0x75090 head:ffffea0001d42400 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 ffffea0001d43d10 ffffea0001da1090 raw: ffff888075091a00 000000000010000d 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 6772, tgid 6772 (modprobe), ts 210459208961, free_ts 208106286416 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x2db/0x350 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0xfed/0x2d30 mm/page_alloc.c:3221 __alloc_pages+0x1cb/0x4a0 mm/page_alloc.c:4477 alloc_pages+0x1aa/0x270 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1862 [inline] allocate_slab+0x25f/0x390 mm/slub.c:2009 new_slab mm/slub.c:2062 [inline] ___slab_alloc+0xbc3/0x15d0 mm/slub.c:3215 __kmem_cache_alloc_bulk mm/slub.c:3966 [inline] kmem_cache_alloc_bulk+0x270/0x860 mm/slub.c:4041 mt_alloc_bulk lib/maple_tree.c:164 [inline] mas_alloc_nodes+0x341/0x8b0 lib/maple_tree.c:1304 mas_node_count_gfp lib/maple_tree.c:1362 [inline] mas_preallocate+0x1bb/0x360 lib/maple_tree.c:5546 vma_iter_prealloc mm/internal.h:1032 [inline] vma_expand+0x1fb/0x6e0 mm/mmap.c:665 mmap_region+0x150f/0x2570 mm/mmap.c:2711 do_mmap+0x850/0xee0 mm/mmap.c:1362 vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543 ksys_mmap_pgoff+0x42b/0x5b0 mm/mmap.c:1408 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:1161 [inline] free_unref_page_prepare+0x62e/0xcb0 mm/page_alloc.c:2348 free_unref_page+0x33/0x370 mm/page_alloc.c:2443 __folio_put_large mm/swap.c:119 [inline] __folio_put+0x109/0x140 mm/swap.c:127 folio_put include/linux/mm.h:1421 [inline] put_page include/linux/mm.h:1490 [inline] napi_frag_unref include/linux/skbuff.h:3435 [inline] skb_release_data+0x543/0x840 net/core/skbuff.c:930 skb_release_all net/core/skbuff.c:1002 [inline] napi_consume_skb net/core/skbuff.c:1310 [inline] napi_consume_skb+0x158/0x2a0 net/core/skbuff.c:1288 skb_defer_free_flush net/core/dev.c:6581 [inline] skb_defer_free_flush net/core/dev.c:6565 [inline] net_rx_action+0x34a/0xcb0 net/core/dev.c:6641 __do_softirq+0x1d4/0x905 kernel/softirq.c:553 Memory state around the buggy address: ffff888075091000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888075091080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888075091100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888075091180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888075091200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================