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BUG: KASAN: slab-out-of-bounds in copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
BUG: KASAN: slab-out-of-bounds in copy_from_sockptr include/linux/sockptr.h:55 [inline]
BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt_old net/bluetooth/rfcomm/sock.c:632 [inline]
BUG: KASAN: slab-out-of-bounds in rfcomm_sock_setsockopt+0x893/0xa70 net/bluetooth/rfcomm/sock.c:673
Read of size 4 at addr ffff888015065983 by task syz-executor.3/5381

CPU: 0 PID: 5381 Comm: syz-executor.3 Not tainted 6.9.0-rc3-next-20240408-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 copy_from_sockptr_offset include/linux/sockptr.h:49 [inline]
 copy_from_sockptr include/linux/sockptr.h:55 [inline]
 rfcomm_sock_setsockopt_old net/bluetooth/rfcomm/sock.c:632 [inline]
 rfcomm_sock_setsockopt+0x893/0xa70 net/bluetooth/rfcomm/sock.c:673
 do_sock_setsockopt+0x3af/0x720 net/socket.c:2311
 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a
RIP: 0033:0x7ff4fcc7de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff4fd9790c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007ff4fcdabf80 RCX: 00007ff4fcc7de69
RDX: 0000000000000003 RSI: 0000000000000012 RDI: 0000000000000007
RBP: 00007ff4fccca47a R08: 0000000000000002 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff4fcdabf80 R15: 00007ffca6ea6388
 </TASK>

Allocated by task 5381:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
 __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slub.c:4078 [inline]
 __kmalloc_noprof+0x200/0x400 mm/slub.c:4091
 kmalloc_noprof include/linux/slab.h:664 [inline]
 __cgroup_bpf_run_filter_setsockopt+0xd47/0x1050 kernel/bpf/cgroup.c:1869
 do_sock_setsockopt+0x6b4/0x720 net/socket.c:2293
 __sys_setsockopt+0x1ae/0x250 net/socket.c:2334
 __do_sys_setsockopt net/socket.c:2343 [inline]
 __se_sys_setsockopt net/socket.c:2340 [inline]
 __x64_sys_setsockopt+0xb5/0xd0 net/socket.c:2340
 do_syscall_64+0xfb/0x240
 entry_SYSCALL_64_after_hwframe+0x72/0x7a

The buggy address belongs to the object at ffff888015065980
 which belongs to the cache kmalloc-8 of size 8
The buggy address is located 1 bytes to the right of
 allocated 2-byte region [ffff888015065980, ffff888015065982)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x15065
flags: 0xfff80000000000(node=0|zone=1|lastcpupid=0xfff)
page_type: 0xffffefff(slab)
raw: 00fff80000000000 ffff888015041280 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080800080 00000001ffffefff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x0(), pid 0, tgid 0 (swapper), ts 2110999481, free_ts 0
 create_dummy_stack mm/page_owner.c:94 [inline]
 register_early_stack+0x8a/0xe0 mm/page_owner.c:110
 init_page_owner+0x48/0x970 mm/page_owner.c:120
 invoke_init_callbacks mm/page_ext.c:148 [inline]
 page_ext_init+0x735/0x7a0 mm/page_ext.c:493
 mm_core_init+0x51/0x60 mm/mm_init.c:2746
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888015065880: fa fc fc fc 05 fc fc fc 05 fc fc fc 05 fc fc fc
 ffff888015065900: 05 fc fc fc 06 fc fc fc 06 fc fc fc 06 fc fc fc
>ffff888015065980: 02 fc fc fc fa fc fc fc 05 fc fc fc 05 fc fc fc
                   ^
 ffff888015065a00: fa fc fc fc fa fc fc fc 05 fc fc fc 07 fc fc fc
 ffff888015065a80: 05 fc fc fc fa fc fc fc fa fc fc fc 05 fc fc fc
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