Bluetooth: hci7: command 0x1003 tx timeout ================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x1c3/0x1f0 net/bluetooth/hci_core.c:1486 Read of size 2 at addr ffff88802749d808 by task kworker/0:1/15 CPU: 0 PID: 15 Comm: kworker/0:1 Not tainted 6.0.0-rc7-syzkaller-00034-ga1375562c0a8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Workqueue: events hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 hci_cmd_timeout+0x1c3/0x1f0 net/bluetooth/hci_core.c:1486 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 6834: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:437 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc_node_track_caller+0x265/0x400 mm/slub.c:4969 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:434 alloc_skb include/linux/skbuff.h:1257 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] hci_cmd_sync_alloc+0x39/0x340 net/bluetooth/hci_sync.c:54 hci_cmd_sync_add+0xaa/0x240 net/bluetooth/hci_sync.c:95 __hci_cmd_sync_sk+0xdf/0x680 net/bluetooth/hci_sync.c:157 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:246 [inline] __hci_cmd_sync_status net/bluetooth/hci_sync.c:271 [inline] hci_read_local_features_sync net/bluetooth/hci_sync.c:2906 [inline] hci_init_stage_sync net/bluetooth/hci_sync.c:2817 [inline] hci_init1_sync+0x1d6/0x6d0 net/bluetooth/hci_sync.c:3000 hci_init_sync net/bluetooth/hci_sync.c:4075 [inline] hci_dev_init_sync+0x24a/0x6b0 net/bluetooth/hci_sync.c:4263 hci_dev_open_sync+0x34e/0x8d0 net/bluetooth/hci_sync.c:4343 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x16a/0x610 net/bluetooth/hci_core.c:975 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Freed by task 6834: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xda/0x210 mm/slub.c:4567 skb_free_head net/core/skbuff.c:662 [inline] skb_release_data+0x586/0x790 net/core/skbuff.c:691 skb_release_all net/core/skbuff.c:756 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:770 kfree_skb include/linux/skbuff.h:1206 [inline] hci_dev_open_sync+0x622/0x8d0 net/bluetooth/hci_sync.c:4377 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x16a/0x610 net/bluetooth/hci_core.c:975 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0xa31/0xce0 kernel/workqueue.c:1517 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers+0x7a2/0x980 kernel/time/timer.c:1790 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803 __do_softirq+0x382/0x793 kernel/softirq.c:571 The buggy address belongs to the object at ffff88802749d800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88802749d800, ffff88802749da00) The buggy address belongs to the physical page: page:ffffea00009d2700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2749c head:ffffea00009d2700 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888012041c80 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3601, tgid 3600 (syz-fuzzer), ts 75185907279, free_ts 68009581983 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] __kmalloc_node_track_caller+0x2c3/0x400 mm/slub.c:4964 kmalloc_reserve net/core/skbuff.c:362 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:434 __napi_alloc_skb+0x16b/0x680 net/core/skbuff.c:575 napi_alloc_skb include/linux/skbuff.h:3207 [inline] page_to_skb+0x299/0xb80 drivers/net/virtio_net.c:496 receive_mergeable+0x34e/0x26e0 drivers/net/virtio_net.c:1119 receive_buf+0x15c/0x1c80 drivers/net/virtio_net.c:1258 virtnet_receive drivers/net/virtio_net.c:1553 [inline] virtnet_poll+0x64e/0x12a0 drivers/net/virtio_net.c:1671 __napi_poll+0xbe/0x4b0 net/core/dev.c:6511 napi_poll net/core/dev.c:6578 [inline] net_rx_action+0x76c/0x10b0 net/core/dev.c:6689 __do_softirq+0x382/0x793 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:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3476 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3248 [inline] kmem_cache_alloc_node+0x1cc/0x350 mm/slub.c:3298 __alloc_skb+0xd5/0x620 net/core/skbuff.c:422 alloc_skb_fclone include/linux/skbuff.h:1307 [inline] tcp_stream_alloc_skb+0x3c/0x300 net/ipv4/tcp.c:861 tcp_sendmsg_locked+0xdcf/0x41b0 net/ipv4/tcp.c:1325 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1483 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] sock_write_iter+0x3d4/0x540 net/socket.c:1108 call_write_iter include/linux/fs.h:2187 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7b5/0xbb0 fs/read_write.c:578 ksys_write+0x19b/0x2c0 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff88802749d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88802749d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88802749d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88802749d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88802749d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================