Bluetooth: hci0: unexpected event 0x2f length: 763 > 260 Bluetooth: Unexpected start frame (len 18) ================================================================== BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:68 [inline] BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] BUG: KASAN: slab-use-after-free in refcount_read include/linux/refcount.h:136 [inline] BUG: KASAN: slab-use-after-free in skb_unref include/linux/skbuff.h:1228 [inline] BUG: KASAN: slab-use-after-free in __sk_skb_reason_drop net/core/skbuff.c:1211 [inline] BUG: KASAN: slab-use-after-free in sk_skb_reason_drop+0x44/0x3d0 net/core/skbuff.c:1239 Read of size 4 at addr ffff8880249124a4 by task kworker/u9:4/5099 CPU: 1 UID: 0 PID: 5099 Comm: kworker/u9:4 Not tainted 6.10.0-rc7-next-20240709-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 Workqueue: hci0 hci_rx_work Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 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 kasan_check_range+0x282/0x290 mm/kasan/generic.c:189 instrument_atomic_read include/linux/instrumented.h:68 [inline] atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline] refcount_read include/linux/refcount.h:136 [inline] skb_unref include/linux/skbuff.h:1228 [inline] __sk_skb_reason_drop net/core/skbuff.c:1211 [inline] sk_skb_reason_drop+0x44/0x3d0 net/core/skbuff.c:1239 kfree_skb_reason include/linux/skbuff.h:1260 [inline] kfree_skb include/linux/skbuff.h:1269 [inline] l2cap_recv_reset net/bluetooth/l2cap_core.c:7472 [inline] l2cap_recv_acldata+0x335/0x1560 net/bluetooth/l2cap_core.c:7496 hci_acldata_packet net/bluetooth/hci_core.c:3797 [inline] hci_rx_work+0x50f/0xca0 net/bluetooth/hci_core.c:4034 process_one_work kernel/workqueue.c:3228 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3309 worker_thread+0x86d/0xd40 kernel/workqueue.c:3387 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Allocated by task 5099: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:4002 [inline] slab_alloc_node mm/slub.c:4051 [inline] kmem_cache_alloc_node_noprof+0x16b/0x320 mm/slub.c:4094 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:664 alloc_skb include/linux/skbuff.h:1320 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:493 [inline] l2cap_recv_frag net/bluetooth/l2cap_core.c:7419 [inline] l2cap_recv_acldata+0x7f8/0x1560 net/bluetooth/l2cap_core.c:7527 hci_acldata_packet net/bluetooth/hci_core.c:3797 [inline] hci_rx_work+0x50f/0xca0 net/bluetooth/hci_core.c:4034 process_one_work kernel/workqueue.c:3228 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3309 worker_thread+0x86d/0xd40 kernel/workqueue.c:3387 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Freed by task 5103: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2258 [inline] slab_free mm/slub.c:4487 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4562 kfree_skb_reason include/linux/skbuff.h:1260 [inline] kfree_skb include/linux/skbuff.h:1269 [inline] l2cap_conn_del+0x8e/0x680 net/bluetooth/l2cap_core.c:1760 l2cap_connect_cfm+0x11f/0x1220 net/bluetooth/l2cap_core.c:7240 hci_connect_cfm include/net/bluetooth/hci_core.h:1965 [inline] hci_conn_failed+0x1f6/0x340 net/bluetooth/hci_conn.c:1265 hci_abort_conn_sync+0x583/0xde0 net/bluetooth/hci_sync.c:5510 hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:328 process_one_work kernel/workqueue.c:3228 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3309 worker_thread+0x86d/0xd40 kernel/workqueue.c:3387 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 The buggy address belongs to the object at ffff8880249123c0 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 228 bytes inside of freed 240-byte region [ffff8880249123c0, ffff8880249124b0) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24912 flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000000 ffff888018ee4780 dead000000000122 0000000000000000 raw: 0000000000000000 00000000000c000c 00000001fdffffff 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 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 10067, tgid 10067 (syz-executor), ts 275527187691, free_ts 275338874113 create_dummy_stack mm/page_owner.c:94 [inline] register_dummy_stack+0x8a/0xe0 mm/page_owner.c:100 init_page_owner+0x3e/0x970 mm/page_owner.c:118 invoke_init_callbacks mm/page_ext.c:148 [inline] page_ext_init+0x732/0x790 mm/page_ext.c:507 mm_core_init+0x4c/0x60 mm/mm_init.c:2680 page last free pid 10067 tgid 10067 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0xd22/0xea0 mm/page_alloc.c:2644 discard_slab mm/slub.c:2589 [inline] __put_partials+0xeb/0x130 mm/slub.c:3057 put_cpu_partial+0x17c/0x250 mm/slub.c:3132 __slab_free+0x2ea/0x3d0 mm/slub.c:4357 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:4002 [inline] slab_alloc_node mm/slub.c:4051 [inline] kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4058 getname_flags+0xb7/0x540 fs/namei.c:139 __se_sys_unlinkat fs/namei.c:4479 [inline] __x64_sys_unlinkat+0xb1/0xf0 fs/namei.c:4479 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Memory state around the buggy address: ffff888024912380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff888024912400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888024912480: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ^ ffff888024912500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888024912580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ==================================================================