================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x114/0x7680 kernel/locking/lockdep.c:4919 Read of size 8 at addr ffff0000e71550b0 by task kworker/u5:5/4260 CPU: 1 PID: 4260 Comm: kworker/u5:5 Not tainted 6.1.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: hci0 hci_rx_work Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 __lock_acquire+0x114/0x7680 kernel/locking/lockdep.c:4919 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x54/0x6c kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] lock_sock_nested+0x90/0x138 net/core/sock.c:3488 lock_sock include/net/sock.h:1748 [inline] l2cap_sock_recv_cb+0x5c/0x440 net/bluetooth/l2cap_sock.c:1522 l2cap_conless_channel net/bluetooth/l2cap_core.c:7817 [inline] l2cap_recv_frame+0xeb0/0x6ce0 net/bluetooth/l2cap_core.c:7870 l2cap_recv_acldata+0x4f4/0x163c net/bluetooth/l2cap_core.c:8582 hci_acldata_packet net/bluetooth/hci_core.c:3897 [inline] hci_rx_work+0x2b8/0xa68 net/bluetooth/hci_core.c:4134 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 10158: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc+0xd8/0x1c4 mm/slab_common.c:968 kmalloc include/linux/slab.h:561 [inline] sk_prot_alloc+0xc4/0x1f0 net/core/sock.c:2047 sk_alloc+0x44/0x3e4 net/core/sock.c:2100 bt_sock_alloc+0x4c/0x140 net/bluetooth/af_bluetooth.c:148 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1903 [inline] l2cap_sock_create+0x140/0x2b8 net/bluetooth/l2cap_sock.c:1943 bt_sock_create+0x14c/0x248 net/bluetooth/af_bluetooth.c:132 __sock_create+0x43c/0x884 net/socket.c:1550 sock_create net/socket.c:1601 [inline] __sys_socket_create net/socket.c:1638 [inline] __sys_socket+0x120/0x32c net/socket.c:1666 __do_sys_socket net/socket.c:1679 [inline] __se_sys_socket net/socket.c:1677 [inline] __arm64_sys_socket+0x7c/0x94 net/socket.c:1677 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 10150: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:1007 sk_prot_free net/core/sock.c:2083 [inline] __sk_destruct+0x4b8/0x75c net/core/sock.c:2169 sk_destruct net/core/sock.c:2184 [inline] __sk_free+0x37c/0x4e8 net/core/sock.c:2195 sk_free+0x60/0xc8 net/core/sock.c:2206 sock_put include/net/sock.h:2028 [inline] l2cap_sock_kill+0x10c/0x214 net/bluetooth/l2cap_sock.c:1280 l2cap_sock_release+0x138/0x1b4 net/bluetooth/l2cap_sock.c:1451 __sock_release net/socket.c:654 [inline] sock_close+0xb8/0x1fc net/socket.c:1400 __fput+0x30c/0x7bc fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x240/0x2f0 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2148/0x3474 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000e7155000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 176 bytes inside of 2048-byte region [ffff0000e7155000, ffff0000e7155800) The buggy address belongs to the physical page: page:0000000024b5323a refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x127150 head:0000000024b5323a order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000122 ffff0000c0002900 raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e7154f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000e7155000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff0000e7155080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000e7155100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000e7155180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Unable to handle kernel paging request at virtual address dfff800000000047 KASAN: null-ptr-deref in range [0x0000000000000238-0x000000000000023f] Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 [dfff800000000047] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 4260 Comm: kworker/u5:5 Tainted: G B 6.1.94-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Workqueue: hci0 hci_rx_work pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : l2cap_publish_rx_avail net/bluetooth/l2cap_sock.c:1171 [inline] pc : l2cap_sock_recv_cb+0x154/0x440 net/bluetooth/l2cap_sock.c:1543 lr : l2cap_sock_recv_cb+0x134/0x440 net/bluetooth/l2cap_sock.c:1541 sp : ffff80001e1c77a0 x29: ffff80001e1c77a0 x28: 1fffe0001cc8e100 x27: 1fffe0001ce2ac07 x26: dfff800000000000 x25: 1fffe0001ce2ac97 x24: 0000000000000000 x23: 0000000000000000 x22: ffff0000e715603e x21: ffff0000e69e88c0 x20: ffff0000e7156000 x19: ffff0000e7155000 x18: 1fffe0003686f176 x17: ffff80001584d000 x16: ffff80000825fb3c x15: 0000000000000002 x14: 0000000000000081 x13: ffff0000d8c75340 x12: 0000000000040000 x11: 000000000003ffff x10: ffff800029a98000 x9 : ffff8000103c2cf4 x8 : 0000000000000047 x7 : 1fffe0003686f177 x6 : ffff8000103c2b88 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff8000103c2cb4 x2 : 0000000000000000 x1 : 0000000000000001 x0 : 0000000000000238 Call trace: l2cap_publish_rx_avail net/bluetooth/l2cap_sock.c:1171 [inline] l2cap_sock_recv_cb+0x154/0x440 net/bluetooth/l2cap_sock.c:1543 l2cap_conless_channel net/bluetooth/l2cap_core.c:7817 [inline] l2cap_recv_frame+0xeb0/0x6ce0 net/bluetooth/l2cap_core.c:7870 l2cap_recv_acldata+0x4f4/0x163c net/bluetooth/l2cap_core.c:8582 hci_acldata_packet net/bluetooth/hci_core.c:3897 [inline] hci_rx_work+0x2b8/0xa68 net/bluetooth/hci_core.c:4134 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Code: 97ac45e8 f9400318 9108e300 d343fc08 (38fa6908) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 97ac45e8 bl 0xfffffffffeb117a0 4: f9400318 ldr x24, [x24] 8: 9108e300 add x0, x24, #0x238 c: d343fc08 lsr x8, x0, #3 * 10: 38fa6908 ldrsb w8, [x8, x26] <-- trapping instruction