================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x24b/0x250 net/bluetooth/hci_core.c:1481 Read of size 2 at addr ffff8880250ef008 by task kworker/0:1/14 CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted 5.19.0-rc1-next-20220609-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 hci_cmd_timeout+0x24b/0x250 net/bluetooth/hci_core.c:1481 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Allocated by task 9894: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:600 [inline] batadv_forw_packet_alloc+0x3ac/0x4d0 net/batman-adv/send.c:519 batadv_iv_ogm_aggregate_new+0x134/0x4e0 net/batman-adv/bat_iv_ogm.c:563 batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:671 [inline] batadv_iv_ogm_schedule_buff+0xe46/0x1430 net/batman-adv/bat_iv_ogm.c:850 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:869 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:862 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x740/0x910 net/batman-adv/bat_iv_ogm.c:1713 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Freed by task 49: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xd6/0x4d0 mm/slub.c:4555 skb_free_head+0xac/0x110 net/core/skbuff.c:658 skb_release_data+0x67a/0x810 net/core/skbuff.c:680 skb_release_all net/core/skbuff.c:745 [inline] __kfree_skb net/core/skbuff.c:759 [inline] kfree_skb_reason.part.0+0xe2/0x320 net/core/skbuff.c:781 kfree_skb_reason+0x85/0x110 include/linux/refcount.h:279 kfree_skb include/linux/skbuff.h:1198 [inline] hci_dev_open_sync+0xb8c/0x2160 net/bluetooth/hci_sync.c:4052 hci_dev_do_open+0x32/0x70 net/bluetooth/hci_core.c:482 hci_power_on+0x133/0x630 net/bluetooth/hci_core.c:970 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 __kasan_record_aux_stack+0xbe/0xd0 mm/kasan/generic.c:348 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x62f/0x1150 kernel/workqueue.c:1517 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers.part.0+0x4a3/0xa80 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 The buggy address belongs to the object at ffff8880250ef000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff8880250ef000, ffff8880250ef200) The buggy address belongs to the physical page: page:ffffea0000943b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x250ec head:ffffea0000943b00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011841c80 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3603, tgid 3601 (syz-fuzzer), ts 112816524617, free_ts 112746837693 prep_new_page mm/page_alloc.c:2460 [inline] get_page_from_freelist+0xa64/0x3d10 mm/page_alloc.c:4279 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5500 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2279 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4950 kmalloc_reserve net/core/skbuff.c:357 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:429 __napi_alloc_skb+0x70/0x310 net/core/skbuff.c:571 napi_alloc_skb include/linux/skbuff.h:3137 [inline] page_to_skb+0x17d/0xc10 drivers/net/virtio_net.c:464 receive_mergeable drivers/net/virtio_net.c:1084 [inline] receive_buf+0xe0f/0x5550 drivers/net/virtio_net.c:1223 virtnet_receive drivers/net/virtio_net.c:1518 [inline] virtnet_poll+0x5cd/0x11a0 drivers/net/virtio_net.c:1627 __napi_poll+0xb3/0x6e0 net/core/dev.c:6486 napi_poll net/core/dev.c:6553 [inline] net_rx_action+0x9c1/0xd90 net/core/dev.c:6664 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1375 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1425 free_unref_page_prepare mm/page_alloc.c:3311 [inline] free_unref_page+0x19/0x7b0 mm/page_alloc.c:3426 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:446 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] kmem_cache_alloc_node+0x255/0x3f0 mm/slub.c:3264 __alloc_skb+0x215/0x340 net/core/skbuff.c:417 alloc_skb_fclone include/linux/skbuff.h:1299 [inline] tcp_stream_alloc_skb+0x66/0x900 net/ipv4/tcp.c:862 tcp_sendmsg_locked+0xad1/0x2fc0 net/ipv4/tcp.c:1297 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1448 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 sock_write_iter+0x284/0x3c0 net/socket.c:1108 call_write_iter include/linux/fs.h:2057 [inline] new_sync_write+0x38a/0x560 fs/read_write.c:504 vfs_write+0x7c0/0xac0 fs/read_write.c:591 ksys_write+0x1e8/0x250 fs/read_write.c:644 Memory state around the buggy address: ffff8880250eef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8880250eef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880250ef000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880250ef080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880250ef100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================