================================================================== BUG: KASAN: use-after-free in mas_safe_min lib/maple_tree.c:721 [inline] BUG: KASAN: use-after-free in mas_next_nentry lib/maple_tree.c:4662 [inline] BUG: KASAN: use-after-free in mas_next_entry+0x344/0x10f0 lib/maple_tree.c:4757 Read of size 8 at addr ffff88807ee95e20 by task syz-executor.5/28530 CPU: 0 PID: 28530 Comm: syz-executor.5 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x220 mm/kasan/report.c:395 kasan_report+0x139/0x170 mm/kasan/report.c:495 mas_safe_min lib/maple_tree.c:721 [inline] mas_next_nentry lib/maple_tree.c:4662 [inline] mas_next_entry+0x344/0x10f0 lib/maple_tree.c:4757 userfaultfd_unregister+0x1240/0x13b0 fs/userfaultfd.c:1657 userfaultfd_ioctl+0x5a1/0x3230 fs/userfaultfd.c:2005 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fb58d28b5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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:00007fb58c5de168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fb58d3ac120 RCX: 00007fb58d28b5a9 RDX: 0000000020000040 RSI: 000000008010aa01 RDI: 0000000000000004 RBP: 00007fb58d2e67b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdce4ab32f R14: 00007fb58c5de300 R15: 0000000000022000 Allocated by task 28500: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:325 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] kmem_cache_alloc_bulk+0x43d/0x580 mm/slub.c:3854 mt_alloc_bulk lib/maple_tree.c:157 [inline] mas_alloc_nodes+0x386/0x650 lib/maple_tree.c:1256 mas_node_count_gfp lib/maple_tree.c:1316 [inline] mas_preallocate+0x133/0x340 lib/maple_tree.c:5719 __vma_adjust+0x886/0x2120 mm/mmap.c:716 __split_vma+0x374/0x4f0 mprotect_fixup+0x538/0x820 mm/mprotect.c:617 do_mprotect_pkey+0x7fc/0xb20 mm/mprotect.c:792 __do_sys_mprotect mm/mprotect.c:819 [inline] __se_sys_mprotect mm/mprotect.c:816 [inline] __x64_sys_mprotect+0x7c/0x90 mm/mprotect.c:816 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 28530: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] kmem_cache_free_bulk+0x137/0x1a0 mm/slub.c:3779 mt_free_bulk lib/maple_tree.c:163 [inline] mas_destroy+0x2d02/0x37b0 lib/maple_tree.c:5769 mas_store_prealloc+0x35d/0x450 lib/maple_tree.c:5704 vma_mas_store mm/mmap.c:435 [inline] __vma_adjust+0x162e/0x2120 mm/mmap.c:784 __split_vma+0x374/0x4f0 userfaultfd_unregister+0x1131/0x13b0 fs/userfaultfd.c:1636 userfaultfd_ioctl+0x5a1/0x3230 fs/userfaultfd.c:2005 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd The buggy address belongs to the object at ffff88807ee95e00 which belongs to the cache maple_node of size 256 The buggy address is located 32 bytes inside of 256-byte region [ffff88807ee95e00, ffff88807ee95f00) The buggy address belongs to the physical page: page:ffffea0001fba500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7ee94 head:ffffea0001fba500 order:1 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff88801204fdc0 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 27171, tgid 27171 (modprobe), ts 802022586337, free_ts 800748151576 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4287 __alloc_pages+0x259/0x560 mm/page_alloc.c:5554 alloc_slab_page+0x70/0xf0 mm/slub.c:1794 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3180 kmem_cache_alloc_bulk+0x1f1/0x580 mm/slub.c:3830 mt_alloc_bulk lib/maple_tree.c:157 [inline] mas_alloc_nodes+0x386/0x650 lib/maple_tree.c:1256 mas_node_count_gfp lib/maple_tree.c:1316 [inline] mas_preallocate+0x133/0x340 lib/maple_tree.c:5719 vma_expand+0x261/0x9b0 mm/mmap.c:542 mmap_region+0xd15/0x1db0 mm/mmap.c:2592 do_mmap+0x8d9/0xf60 mm/mmap.c:1412 vm_mmap_pgoff+0x1e5/0x2f0 mm/util.c:520 ksys_mmap_pgoff+0x48c/0x6d0 mm/mmap.c:1458 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 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:1458 [inline] free_pcp_prepare+0x80c/0x8f0 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3482 free_slab mm/slub.c:2031 [inline] discard_slab mm/slub.c:2037 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2586 put_cpu_partial+0x116/0x180 mm/slub.c:2662 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x1f/0x70 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] kmem_cache_alloc_node+0x1ca/0x340 mm/slub.c:3443 __alloc_skb+0xd5/0x620 net/core/skbuff.c:497 alloc_skb_fclone include/linux/skbuff.h:1317 [inline] tcp_stream_alloc_skb+0x3c/0x300 net/ipv4/tcp.c:862 tcp_sendmsg_locked+0xdcf/0x41d0 net/ipv4/tcp.c:1325 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1483 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] sock_write_iter+0x3d4/0x540 net/socket.c:1108 call_write_iter include/linux/fs.h:2191 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7b5/0xbb0 fs/read_write.c:584 ksys_write+0x19b/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 Memory state around the buggy address: ffff88807ee95d00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807ee95d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807ee95e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807ee95e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807ee95f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================