================================================================== BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] BUG: KASAN: use-after-free in refcount_read include/linux/refcount.h:147 [inline] BUG: KASAN: use-after-free in skb_unref include/linux/skbuff.h:1044 [inline] BUG: KASAN: use-after-free in kfree_skb+0x32/0x3d0 net/core/skbuff.c:692 Read of size 4 at addr ffff8881d03de5d4 by task kworker/1:6/3147 CPU: 1 PID: 3147 Comm: kworker/1:6 Not tainted 5.7.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: usb_hub_wq hub_event Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x415 mm/kasan/report.c:382 __kasan_report.cold+0x37/0x7d mm/kasan/report.c:511 kasan_report+0x33/0x50 mm/kasan/common.c:625 check_memory_region_inline mm/kasan/generic.c:187 [inline] check_memory_region+0x173/0x1d0 mm/kasan/generic.c:193 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] refcount_read include/linux/refcount.h:147 [inline] skb_unref include/linux/skbuff.h:1044 [inline] kfree_skb+0x32/0x3d0 net/core/skbuff.c:692 hif_usb_regout_cb+0x156/0x1c0 drivers/net/wireless/ath/ath9k/hif_usb.c:97 __usb_hcd_giveback_urb+0x29a/0x550 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1716 dummy_timer+0x125e/0x32b4 drivers/usb/gadget/udc/dummy_hcd.c:1967 call_timer_fn+0x1ac/0x700 kernel/time/timer.c:1405 expire_timers kernel/time/timer.c:1450 [inline] __run_timers kernel/time/timer.c:1774 [inline] __run_timers kernel/time/timer.c:1741 [inline] run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1787 __do_softirq+0x21e/0x9aa kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x178/0x1a0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:546 [inline] smp_apic_timer_interrupt+0x141/0x540 arch/x86/kernel/apic/apic.c:1140 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 RIP: 0010:usb_submit_urb+0x18b/0x1460 drivers/usb/core/urb.c:376 Code: fd c1 eb 0f 48 b8 00 00 00 00 00 fc ff df 83 e3 0f 48 8d 5c dd 00 48 89 da 48 c1 ea 03 80 3c 02 00 0f 85 39 11 00 00 48 8b 1b <48> 85 db 0f 84 d8 10 00 00 e8 67 bf d2 fd 49 8d 7f 48 48 b8 00 00 RSP: 0018:ffff8881ab1f7738 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: dffffc0000000000 RBX: ffff8881d4a25050 RCX: ffffc9000da14000 RDX: 1ffff1103a944ab9 RSI: ffffffff836d7f72 RDI: 0000000000000005 RBP: ffff8881d4a255c8 R08: ffff8881d25d6300 R09: 0000000000000000 R10: ffff8881ccf0de03 R11: ffffed10399e1bc0 R12: dffffc0000000000 R13: 00000000000003e8 R14: ffff8881ccf0de84 R15: ffff8881ccf0de00 usb_start_wait_urb+0x101/0x4c0 drivers/usb/core/message.c:58 usb_internal_control_msg drivers/usb/core/message.c:102 [inline] usb_control_msg+0x31c/0x4a0 drivers/usb/core/message.c:153 get_port_status drivers/usb/core/hub.c:573 [inline] hub_ext_port_status+0x125/0x460 drivers/usb/core/hub.c:590 hub_port_status drivers/usb/core/hub.c:612 [inline] hub_port_debounce+0x18c/0x350 drivers/usb/core/hub.c:4409 hub_port_debounce_be_stable drivers/usb/core/hub.h:164 [inline] hub_port_connect drivers/usb/core/hub.c:5071 [inline] hub_port_connect_change drivers/usb/core/hub.c:5348 [inline] port_event drivers/usb/core/hub.c:5494 [inline] hub_event+0x2c63/0x43c0 drivers/usb/core/hub.c:5576 process_one_work+0x965/0x1630 kernel/workqueue.c:2268 process_scheduled_works kernel/workqueue.c:2330 [inline] worker_thread+0x7ab/0xe20 kernel/workqueue.c:2416 kthread+0x326/0x430 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Allocated by task 3131: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:468 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc_node mm/slub.c:2797 [inline] kmem_cache_alloc_node+0xdc/0x330 mm/slub.c:2833 __alloc_skb+0xba/0x5a0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1083 [inline] htc_connect_service+0x2cc/0x840 drivers/net/wireless/ath/ath9k/htc_hst.c:257 ath9k_wmi_connect+0xd2/0x1a0 drivers/net/wireless/ath/ath9k/wmi.c:265 ath9k_init_htc_services.constprop.0+0xb4/0x650 drivers/net/wireless/ath/ath9k/htc_drv_init.c:146 ath9k_htc_probe_device+0x25a/0x1da0 drivers/net/wireless/ath/ath9k/htc_drv_init.c:959 ath9k_htc_hw_init+0x31/0x60 drivers/net/wireless/ath/ath9k/htc_hst.c:501 ath9k_hif_usb_firmware_cb+0x274/0x510 drivers/net/wireless/ath/ath9k/hif_usb.c:1187 request_firmware_work_func+0x126/0x242 drivers/base/firmware_loader/main.c:1005 process_one_work+0x965/0x1630 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x326/0x430 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Freed by task 3131: save_stack+0x1b/0x40 mm/kasan/common.c:49 set_track mm/kasan/common.c:57 [inline] kasan_set_free_info mm/kasan/common.c:317 [inline] __kasan_slab_free+0x117/0x160 mm/kasan/common.c:456 slab_free_hook mm/slub.c:1455 [inline] slab_free_freelist_hook mm/slub.c:1488 [inline] slab_free mm/slub.c:3045 [inline] kmem_cache_free+0x9b/0x360 mm/slub.c:3061 kfree_skbmem net/core/skbuff.c:622 [inline] kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:616 __kfree_skb net/core/skbuff.c:679 [inline] kfree_skb net/core/skbuff.c:696 [inline] kfree_skb+0x102/0x3d0 net/core/skbuff.c:690 htc_connect_service.cold+0xa9/0x109 drivers/net/wireless/ath/ath9k/htc_hst.c:282 ath9k_wmi_connect+0xd2/0x1a0 drivers/net/wireless/ath/ath9k/wmi.c:265 ath9k_init_htc_services.constprop.0+0xb4/0x650 drivers/net/wireless/ath/ath9k/htc_drv_init.c:146 ath9k_htc_probe_device+0x25a/0x1da0 drivers/net/wireless/ath/ath9k/htc_drv_init.c:959 ath9k_htc_hw_init+0x31/0x60 drivers/net/wireless/ath/ath9k/htc_hst.c:501 ath9k_hif_usb_firmware_cb+0x274/0x510 drivers/net/wireless/ath/ath9k/hif_usb.c:1187 request_firmware_work_func+0x126/0x242 drivers/base/firmware_loader/main.c:1005 process_one_work+0x965/0x1630 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x326/0x430 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 The buggy address belongs to the object at ffff8881d03de500 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 212 bytes inside of 224-byte region [ffff8881d03de500, ffff8881d03de5e0) The buggy address belongs to the page: page:ffffea000740f780 refcount:1 mapcount:0 mapping:000000008e32b1dc index:0x0 flags: 0x200000000000200(slab) raw: 0200000000000200 dead000000000100 dead000000000122 ffff8881da175400 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d03de480: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d03de500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881d03de580: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8881d03de600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8881d03de680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================