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BUG: KASAN: slab-use-after-free in smk_access+0x54/0x148 security/smack/smack_access.c:147
Read at addr fbf00000110c39b0 by task syz.0.4998/19604
Pointer tag: [fb], memory tag: [f9]

CPU: 1 UID: 0 PID: 19604 Comm: syz.0.4998 Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:319
 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:326
 __dump_stack lib/dump_stack.c:93 [inline]
 dump_stack_lvl+0x78/0x90 lib/dump_stack.c:119
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x108/0x618 mm/kasan/report.c:488
 kasan_report+0x88/0xac mm/kasan/report.c:601
 report_tag_fault arch/arm64/mm/fault.c:332 [inline]
 do_tag_recovery arch/arm64/mm/fault.c:344 [inline]
 __do_kernel_fault+0x170/0x1c8 arch/arm64/mm/fault.c:386
 do_bad_area arch/arm64/mm/fault.c:486 [inline]
 do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:803
 do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:879
 el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:432
 el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:492
 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:593
 smk_access+0x54/0x148 security/smack/smack_access.c:147
 smack_watch_key+0xe0/0xf8 security/smack/smack_lsm.c:4656
 security_watch_key+0x58/0x148 security/security.c:4448
 keyctl_watch_key+0xb0/0x1cc security/keys/keyctl.c:1813
 __do_sys_keyctl security/keys/keyctl.c:2021 [inline]
 __se_sys_keyctl security/keys/keyctl.c:1874 [inline]
 __arm64_sys_keyctl+0x50/0x290 security/keys/keyctl.c:1874
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151
 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598

Allocated by task 3266:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47
 save_stack_info+0x40/0x158 mm/kasan/tags.c:106
 kasan_save_alloc_info+0x14/0x20 mm/kasan/tags.c:142
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 poison_kmalloc_redzone mm/kasan/common.c:343 [inline]
 __kasan_kmalloc+0xb4/0xb8 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4159 [inline]
 __kmalloc_node_noprof+0x1c8/0x37c mm/slub.c:4165
 kmalloc_node_noprof include/linux/slab.h:717 [inline]
 __vmalloc_area_node mm/vmalloc.c:3642 [inline]
 __vmalloc_node_range_noprof+0x1a8/0x858 mm/vmalloc.c:3837
 __vmalloc_node_noprof mm/vmalloc.c:3902 [inline]
 vzalloc_noprof+0x94/0xa4 mm/vmalloc.c:3975
 alloc_counters.isra.0+0x20/0x13c net/ipv4/netfilter/arp_tables.c:660
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:837 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
 do_ip6t_get_ctl+0x27c/0x49c net/ipv6/netfilter/ip6_tables.c:1677
 nf_getsockopt+0x60/0x8c net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0xf8/0x1f4 net/ipv6/ipv6_sockglue.c:1493
 tcp_getsockopt+0x20/0x48 net/ipv4/tcp.c:4670
 sock_common_getsockopt+0x1c/0x28 net/core/sock.c:3776
 do_sock_getsockopt+0x148/0x288 net/socket.c:2392
 __sys_getsockopt+0x78/0xd0 net/socket.c:2421
 __do_sys_getsockopt net/socket.c:2431 [inline]
 __se_sys_getsockopt net/socket.c:2428 [inline]
 __arm64_sys_getsockopt+0x24/0x34 net/socket.c:2428
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151
 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598

Freed by task 3266:
 kasan_save_stack+0x3c/0x64 mm/kasan/common.c:47
 save_stack_info+0x40/0x158 mm/kasan/tags.c:106
 kasan_save_free_info+0x18/0x24 mm/kasan/tags.c:147
 poison_slab_object+0x178/0x1c0 mm/kasan/common.c:240
 __kasan_slab_free+0x30/0x48 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2250 [inline]
 slab_free mm/slub.c:4474 [inline]
 kfree+0xd8/0x28c mm/slub.c:4595
 kvfree+0x3c/0x4c mm/util.c:696
 vfree+0xf0/0x34c mm/vmalloc.c:3371
 copy_entries_to_user net/ipv6/netfilter/ip6_tables.c:882 [inline]
 get_entries net/ipv6/netfilter/ip6_tables.c:1039 [inline]
 do_ip6t_get_ctl+0x3c0/0x49c net/ipv6/netfilter/ip6_tables.c:1677
 nf_getsockopt+0x60/0x8c net/netfilter/nf_sockopt.c:116
 ipv6_getsockopt+0xf8/0x1f4 net/ipv6/ipv6_sockglue.c:1493
 tcp_getsockopt+0x20/0x48 net/ipv4/tcp.c:4670
 sock_common_getsockopt+0x1c/0x28 net/core/sock.c:3776
 do_sock_getsockopt+0x148/0x288 net/socket.c:2392
 __sys_getsockopt+0x78/0xd0 net/socket.c:2421
 __do_sys_getsockopt net/socket.c:2431 [inline]
 __se_sys_getsockopt net/socket.c:2428 [inline]
 __arm64_sys_getsockopt+0x24/0x34 net/socket.c:2428
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x48/0x110 arch/arm64/kernel/syscall.c:49
 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:132
 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:151
 el0_svc+0x34/0xec arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:598

The buggy address belongs to the object at fff00000110c39b0
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes inside of
 16-byte region [fff00000110c39b0, fff00000110c39c0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xf0f00000110c3a20 pfn:0x510c3
flags: 0x1ffc00000000000(node=0|zone=0|lastcpupid=0x7ff|kasantag=0x0)
page_type: 0xfdffffff(slab)
raw: 01ffc00000000000 f9f0000003001400 dead000000000122 0000000000000000
raw: f0f00000110c3a20 00000000810000fa 00000001fdffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 fff00000110c3700: fe f3 fe fc fe fe f3 f4 f2 fe fe fe fe fe fe fc
 fff00000110c3800: fe fe fe f1 f4 f1 f5 f9 f9 fe fe f7 fe f6 fe fe
>fff00000110c3900: fe fe fe fe f4 fe f9 fe fe fb f5 f9 fe fe fe fe
                                                    ^
 fff00000110c3a00: fe fe fe f9 fe f0 fe fe fe fe fe fe fe fe fe fe
 fff00000110c3b00: f1 fe fe fe fa fe fe fe fb fe fe fc fe fe f4 fb
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