RBP: 00007f584f6d7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f584f8cfb1f R14: 00007f5850379300 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 ffff88807c294d00 by task syz-executor.2/31814 CPU: 0 PID: 31814 Comm: syz-executor.2 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 __vm_munmap+0x137/0x380 mm/mmap.c:2899 __do_sys_munmap mm/mmap.c:2916 [inline] __se_sys_munmap mm/mmap.c:2913 [inline] __x64_sys_munmap+0x62/0x80 mm/mmap.c:2913 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: 0033:0x7f584f68c389 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:00007f5850379168 EFLAGS: 00000246 ORIG_RAX: 000000000000000b RAX: ffffffffffffffda RBX: 00007f584f7abf80 RCX: 00007f584f68c389 RDX: 0000000000000000 RSI: 0000000000002000 RDI: 0000000020ba0000 RBP: 00007f584f6d7493 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f584f8cfb1f R14: 00007f5850379300 R15: 0000000000022000 Allocated by task 31809: 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+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 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 The buggy address belongs to the object at ffff88807c294c00 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 [ffff88807c294c00, ffff88807c294d00) The buggy address belongs to the physical page: page:ffffea0001f0a500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7c294 head:ffffea0001f0a500 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 31809, tgid 31809 (syz-executor.2), ts 2389973017592, free_ts 2386982894944 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 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3314 __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] slab_alloc mm/slub.c:3478 [inline] __kmem_cache_alloc_lru mm/slub.c:3485 [inline] kmem_cache_alloc+0x365/0x380 mm/slub.c:3494 mt_alloc_one lib/maple_tree.c:159 [inline] mas_alloc_nodes+0x4ec/0x8b0 lib/maple_tree.c:1282 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+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 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 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x195/0x220 mm/kasan/quarantine.c:292 __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:750 [inline] slab_alloc_node mm/slub.c:3470 [inline] kmem_cache_alloc_node+0x1c6/0x3e0 mm/slub.c:3515 kmalloc_reserve+0x165/0x270 net/core/skbuff.c:559 __alloc_skb+0x129/0x330 net/core/skbuff.c:644 alloc_skb include/linux/skbuff.h:1289 [inline] alloc_skb_with_frags+0x9a/0x6f0 net/core/skbuff.c:6228 sock_alloc_send_pskb+0x7a7/0x930 net/core/sock.c:2782 sock_alloc_send_skb include/net/sock.h:1871 [inline] __ip_append_data+0x1cca/0x3c90 net/ipv4/ip_output.c:1120 ip_make_skb+0x22a/0x2a0 net/ipv4/ip_output.c:1543 udp_sendmsg+0x1b8c/0x2840 net/ipv4/udp.c:1256 inet_sendmsg+0x9d/0xe0 net/ipv4/af_inet.c:830 sock_sendmsg_nosec net/socket.c:725 [inline] sock_sendmsg+0xde/0x190 net/socket.c:748 ____sys_sendmsg+0x34a/0x920 net/socket.c:2494 Memory state around the buggy address: ffff88807c294c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88807c294c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88807c294d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88807c294d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807c294e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================