device veth1_macvtap left promiscuous mode device veth0_macvtap left promiscuous mode device veth1_vlan left promiscuous mode device veth0_vlan left promiscuous mode ================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:43 [inline] BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:967 [inline] BUG: KASAN: use-after-free in kfree_skb+0x32/0x3d0 net/core/skbuff.c:668 Read of size 4 at addr ffff8880a2eb6a24 by task syz-executor.3/9778 CPU: 0 PID: 9778 Comm: syz-executor.3 Not tainted 4.19.186-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report+0x8f/0xa0 mm/kasan/report.c:412 atomic_read include/asm-generic/atomic-instrumented.h:21 [inline] refcount_read include/linux/refcount.h:43 [inline] skb_unref include/linux/skbuff.h:967 [inline] kfree_skb+0x32/0x3d0 net/core/skbuff.c:668 hci_dev_do_open+0xaf0/0x1260 net/bluetooth/hci_core.c:1511 hci_dev_open+0x130/0x250 net/bluetooth/hci_core.c:1577 hci_sock_ioctl+0x57e/0x7d0 net/bluetooth/hci_sock.c:1018 sock_do_ioctl+0xcb/0x2d0 net/socket.c:950 sock_ioctl+0x2ef/0x5d0 net/socket.c:1074 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466217 Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 48 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 00 00 00 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:00007ffdb45c1a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000001e653bc RCX: 0000000000466217 RDX: 0000000000000003 RSI: 00000000400448c9 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000000000000000 R09: 00007faeebf36700 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 000000000056ca68 R14: 0000000000000000 R15: 00000000000000f8 Allocated by task 8123: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 skb_clone+0x151/0x3d0 net/core/skbuff.c:1293 hci_cmd_work+0x18f/0x360 net/bluetooth/hci_core.c:4397 process_one_work+0x864/0x1570 kernel/workqueue.c:2152 worker_thread+0x64c/0x1130 kernel/workqueue.c:2295 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Freed by task 8120: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595 __kfree_skb net/core/skbuff.c:655 [inline] kfree_skb+0x127/0x3d0 net/core/skbuff.c:672 hci_cmd_work+0x182/0x360 net/bluetooth/hci_core.c:4395 process_one_work+0x864/0x1570 kernel/workqueue.c:2152 worker_thread+0x64c/0x1130 kernel/workqueue.c:2295 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff8880a2eb6940 which belongs to the cache skbuff_head_cache of size 232 The buggy address is located 228 bytes inside of 232-byte region [ffff8880a2eb6940, ffff8880a2eb6a28) The buggy address belongs to the page: page:ffffea00028bad80 count:1 mapcount:0 mapping:ffff88823b2b7540 index:0x0 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00026b78c8 ffffea00026c9488 ffff88823b2b7540 raw: 0000000000000000 ffff8880a2eb6080 000000010000000c 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a2eb6900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8880a2eb6980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880a2eb6a00: fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc ^ ffff8880a2eb6a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880a2eb6b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc ==================================================================