================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x1b5/0x1e0 net/bluetooth/hci_core.c:1474 Read of size 2 at addr ffff88807fabcc08 by task kworker/0:23/5365 CPU: 0 PID: 5365 Comm: kworker/0:23 Not tainted 5.18.0-syzkaller-11972-gd1dc87763f40 #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+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 hci_cmd_timeout+0x1b5/0x1e0 net/bluetooth/hci_core.c:1474 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 Allocated by task 5821: 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:436 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:515 kasan_kmalloc include/linux/kasan.h:234 [inline] kmem_cache_alloc_trace+0x94/0x310 mm/slub.c:3255 kmalloc include/linux/slab.h:600 [inline] kzalloc include/linux/slab.h:733 [inline] usbdev_open+0xa4/0x780 drivers/usb/core/devio.c:1030 chrdev_open+0x5fb/0x680 fs/char_dev.c:414 do_dentry_open+0x789/0x1040 fs/open.c:848 do_open fs/namei.c:3527 [inline] path_openat+0x26c0/0x2ec0 fs/namei.c:3660 do_filp_open+0x277/0x4f0 fs/namei.c:3687 do_sys_openat2+0x13b/0x500 fs/open.c:1278 do_sys_open fs/open.c:1294 [inline] __do_sys_openat fs/open.c:1310 [inline] __se_sys_openat fs/open.c:1305 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1305 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+0x46/0xb0 Freed by task 3640: 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+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kfree+0xc6/0x210 mm/slub.c:4555 skb_free_head net/core/skbuff.c:655 [inline] skb_release_data+0x596/0x730 net/core/skbuff.c:677 skb_release_all net/core/skbuff.c:742 [inline] __kfree_skb+0x56/0x1d0 net/core/skbuff.c:756 kfree_skb include/linux/skbuff.h:1375 [inline] hci_dev_open_sync+0x107e/0x1340 net/bluetooth/hci_sync.c:4052 hci_dev_do_open net/bluetooth/hci_core.c:482 [inline] hci_power_on+0x180/0x650 net/bluetooth/hci_core.c:963 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 The buggy address belongs to the object at ffff88807fabcc00 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88807fabcc00, ffff88807fabce00) The buggy address belongs to the physical page: page:ffffea0001feaf00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7fabc head:ffffea0001feaf00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888011441c80 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 3594, tgid 3593 (syz-fuzzer), ts 64263617209, free_ts 55607791972 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4198 __alloc_pages+0x259/0x560 mm/page_alloc.c:5426 alloc_slab_page+0x70/0xf0 mm/slub.c:1797 allocate_slab+0x5e/0x520 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3002 __slab_alloc mm/slub.c:3089 [inline] slab_alloc_node mm/slub.c:3180 [inline] __kmalloc_node_track_caller+0x2bb/0x3f0 mm/slub.c:4950 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0x11d/0x660 net/core/skbuff.c:426 __napi_alloc_skb+0x13a/0x650 net/core/skbuff.c:568 napi_alloc_skb include/linux/skbuff.h:3307 [inline] page_to_skb+0x28f/0xb10 drivers/net/virtio_net.c:464 receive_mergeable+0x34e/0x26c0 drivers/net/virtio_net.c:1084 receive_buf+0x152/0x1bd0 drivers/net/virtio_net.c:1223 virtnet_receive drivers/net/virtio_net.c:1518 [inline] virtnet_poll+0x60d/0x11e0 drivers/net/virtio_net.c:1627 __napi_poll+0xbe/0x4b0 net/core/dev.c:6486 napi_poll net/core/dev.c:6553 [inline] net_rx_action+0x76c/0x10b0 net/core/dev.c:6664 __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:1371 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x7d/0x390 mm/page_alloc.c:3438 free_slab mm/slub.c:2041 [inline] discard_slab mm/slub.c:2047 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2521 put_cpu_partial+0x116/0x180 mm/slub.c:2597 do_slab_free mm/slub.c:3495 [inline] ___cache_free+0x118/0x1a0 mm/slub.c:3514 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: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+0x1cd/0x340 mm/slub.c:3264 __alloc_skb+0xd5/0x660 net/core/skbuff.c:414 alloc_skb_fclone include/linux/skbuff.h:1476 [inline] tcp_stream_alloc_skb+0x67/0x480 net/ipv4/tcp.c:862 tcp_sendmsg_locked+0xd64/0x3fc0 net/ipv4/tcp.c:1297 tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1448 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] sock_write_iter+0x3e7/0x560 net/socket.c:1108 call_write_iter include/linux/fs.h:2060 [inline] new_sync_write fs/read_write.c:504 [inline] vfs_write+0xa22/0xd40 fs/read_write.c:591 ksys_write+0x19b/0x2c0 fs/read_write.c:644 Memory state around the buggy address: ffff88807fabcb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807fabcb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807fabcc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807fabcc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807fabcd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================