Bluetooth: hci4: Dropping invalid advertising data
Bluetooth: hci4: Dropping invalid advertising data
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BUG: KASAN: slab-out-of-bounds in hci_le_adv_report_evt net/bluetooth/hci_event.c:5394 [inline]
BUG: KASAN: slab-out-of-bounds in hci_le_meta_evt+0x3754/0x3f20 net/bluetooth/hci_event.c:5694
Read of size 1 at addr ffff8880996f0c4f by task kworker/u5:5/8157

CPU: 1 PID: 8157 Comm: kworker/u5:5 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Workqueue: hci4 hci_rx_work
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 mm/kasan/report.c:412 [inline]
 __asan_report_load1_noabort+0x88/0x90 mm/kasan/report.c:430
 hci_le_adv_report_evt net/bluetooth/hci_event.c:5394 [inline]
 hci_le_meta_evt+0x3754/0x3f20 net/bluetooth/hci_event.c:5694
 hci_event_packet+0x34ad/0x7e20 net/bluetooth/hci_event.c:5959
 hci_rx_work+0x4ad/0xc70 net/bluetooth/hci_core.c:4380
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

Allocated by task 12138:
 __do_kmalloc_node mm/slab.c:3689 [inline]
 __kmalloc_node_track_caller+0x4c/0x70 mm/slab.c:3703
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0xae/0x560 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:995 [inline]
 bt_skb_alloc include/net/bluetooth/bluetooth.h:339 [inline]
 vhci_get_user drivers/bluetooth/hci_vhci.c:180 [inline]
 vhci_write+0xbd/0x450 drivers/bluetooth/hci_vhci.c:299
 call_write_iter include/linux/fs.h:1821 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x51b/0x770 fs/read_write.c:487
 vfs_write+0x1f3/0x540 fs/read_write.c:549
 ksys_write+0x12b/0x2a0 fs/read_write.c:599
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 4700:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 __rcu_reclaim kernel/rcu/rcu.h:236 [inline]
 rcu_do_batch kernel/rcu/tree.c:2584 [inline]
 invoke_rcu_callbacks kernel/rcu/tree.c:2897 [inline]
 __rcu_process_callbacks kernel/rcu/tree.c:2864 [inline]
 rcu_process_callbacks+0x8ff/0x18b0 kernel/rcu/tree.c:2881
 __do_softirq+0x265/0x980 kernel/softirq.c:292

The buggy address belongs to the object at ffff8880996f0a00
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 79 bytes to the right of
 512-byte region [ffff8880996f0a00, ffff8880996f0c00)
The buggy address belongs to the page:
page:ffffea000265bc00 count:1 mapcount:0 mapping:ffff88813bff0940 index:0xffff8880996f0780
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002c5b608 ffffea0002b60788 ffff88813bff0940
raw: ffff8880996f0780 ffff8880996f0000 0000000100000003 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880996f0b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8880996f0b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880996f0c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                              ^
 ffff8880996f0c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880996f0d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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