================================================================== BUG: KASAN: slab-use-after-free in sco_chan_del+0xe6/0x440 Write of size 4 at addr ffff88801a1ca010 by task syz-executor.4/4325 CPU: 1 PID: 4325 Comm: syz-executor.4 Not tainted 6.3.0-rc1-next-20230308 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0x91/0xf0 print_report+0xcc/0x620 kasan_report+0xc0/0xf0 kasan_check_range+0x39/0x1d0 sco_chan_del+0xe6/0x440 __sco_sock_close+0x21e/0x770 sco_sock_release+0xa1/0x400 __sock_release+0xd2/0x2a0 sock_close+0x1c/0x30 __fput+0x263/0xa40 task_work_run+0x174/0x280 get_signal+0x1d3/0x2450 arch_do_signal_or_restart+0x79/0x590 exit_to_user_mode_prepare+0x122/0x190 syscall_exit_to_user_mode+0x1d/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f9b38132b19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9b356a8188 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: fffffffffffffffc RBX: 00007f9b38245f60 RCX: 00007f9b38132b19 RDX: 0000000000000008 RSI: 0000000020000040 RDI: 0000000000000009 RBP: 00007f9b3818cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff0efc548f R14: 00007f9b356a8300 R15: 0000000000022000 Allocated by task 4116: kasan_save_stack+0x22/0x50 kasan_set_track+0x25/0x30 __kasan_kmalloc+0x7f/0x90 hci_conn_add+0xa3/0x1470 hci_connect_sco+0x422/0x9d0 sco_sock_connect+0x358/0xa60 __sys_connect_file+0x159/0x1a0 __sys_connect+0x169/0x1a0 __x64_sys_connect+0x73/0xb0 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Freed by task 4356: kasan_save_stack+0x22/0x50 kasan_set_track+0x25/0x30 kasan_save_free_info+0x2e/0x50 __kasan_slab_free+0x10a/0x190 __kmem_cache_free+0xd1/0x2f0 device_release+0xa6/0x240 kobject_put+0x177/0x270 put_device+0x1f/0x30 hci_conn_del+0x28f/0x940 hci_conn_del+0x6cf/0x940 hci_conn_hash_flush+0x195/0x230 hci_dev_close_sync+0x57f/0xff0 hci_rfkill_set_block+0x17b/0x1c0 rfkill_set_block+0x1fd/0x540 rfkill_fop_write+0x2b7/0x540 vfs_write+0x2cf/0xdc0 ksys_write+0x1f4/0x260 do_syscall_64+0x3f/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc Last potentially related work creation: kasan_save_stack+0x22/0x50 __kasan_record_aux_stack+0x95/0xb0 __queue_work+0x5d8/0x1260 __queue_delayed_work+0x1c8/0x270 queue_delayed_work_on+0xcd/0xd0 sco_chan_del+0x1db/0x440 __sco_sock_close+0x21e/0x770 sco_sock_release+0xa1/0x400 __sock_release+0xd2/0x2a0 sock_close+0x1c/0x30 __fput+0x263/0xa40 task_work_run+0x174/0x280 get_signal+0x1d3/0x2450 arch_do_signal_or_restart+0x79/0x590 exit_to_user_mode_prepare+0x122/0x190 syscall_exit_to_user_mode+0x1d/0x50 do_syscall_64+0x4c/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc The buggy address belongs to the object at ffff88801a1ca000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 16 bytes inside of freed 4096-byte region [ffff88801a1ca000, ffff88801a1cb000) The buggy address belongs to the physical page: page:000000002876e1d5 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a1c8 head:000000002876e1d5 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x100000000010200(slab|head|node=0|zone=1) page_type: 0xffffffff() raw: 0100000000010200 ffff888008442140 ffffea0001161a00 dead000000000002 raw: 0000000000000000 0000000000040004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88801a1c9f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801a1c9f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801a1ca000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801a1ca080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801a1ca100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== loop4: detected capacity change from 0 to 40 lo: entered promiscuous mode lo: entered allmulticast mode platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 syz-executor.0 (4382) used greatest stack depth: 23640 bytes left loop4: detected capacity change from 0 to 40 platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 audit: type=1400 audit(1678577231.436:10): avc: denied { relabelto } for pid=4405 comm="syz-executor.3" name="file1" dev="sda" ino=16002 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:mouse_device_t:s0 tclass=file permissive=1 audit: type=1400 audit(1678577231.453:11): avc: denied { read } for pid=4405 comm="syz-executor.3" name="file1" dev="sda" ino=16002 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:mouse_device_t:s0 tclass=file permissive=1 audit: type=1400 audit(1678577231.460:12): avc: denied { open } for pid=4405 comm="syz-executor.3" path="/syzkaller-testdir841279215/syzkaller.gFAbhd/10/file1" dev="sda" ino=16002 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:mouse_device_t:s0 tclass=file permissive=1 audit: type=1400 audit(1678577231.463:13): avc: denied { setattr } for pid=4405 comm="syz-executor.3" name="file1" dev="sda" ino=16002 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:mouse_device_t:s0 tclass=file permissive=1 audit: type=1400 audit(1678577231.561:14): avc: denied { getattr } for pid=270 comm="syz-executor.3" path="/syzkaller-testdir841279215/syzkaller.gFAbhd/10/file1" dev="sda" ino=16002 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:mouse_device_t:s0 tclass=file permissive=1 audit: type=1400 audit(1678577231.566:15): avc: denied { unlink } for pid=270 comm="syz-executor.3" name="file1" dev="sda" ino=16002 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:mouse_device_t:s0 tclass=file permissive=1