================================================================== 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 ffff8881d213c994 by task syz-executor.4/386 CPU: 0 PID: 386 Comm: syz-executor.4 Not tainted 5.7.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 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:_raw_spin_unlock_irq+0x27/0x30 kernel/locking/spinlock.c:200 Code: 44 00 00 55 48 8b 74 24 08 48 89 fd 48 8d 7f 18 e8 2e 72 90 fb 48 89 ef e8 c6 6e 91 fb e8 b1 13 af fb fb 65 ff 0d c1 86 6b 7a <5d> c3 0f 1f 80 00 00 00 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 RSP: 0018:ffff8881acbcfb38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffff8881cf9f0000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8881cf9f087c RBP: ffff8881db234940 R08: ffff8881cf9f0000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8881db234940 R13: ffffffff8702f800 R14: ffff8881d274af40 R15: 0000000000000000 finish_lock_switch kernel/sched/core.c:3106 [inline] finish_task_switch+0x11d/0x5d0 kernel/sched/core.c:3206 context_switch kernel/sched/core.c:3370 [inline] __schedule+0x89a/0x1d80 kernel/sched/core.c:4083 schedule+0xcd/0x2b0 kernel/sched/core.c:4158 freezable_schedule include/linux/freezer.h:172 [inline] do_nanosleep+0x21f/0x650 kernel/time/hrtimer.c:1879 hrtimer_nanosleep+0x1df/0x3a0 kernel/time/hrtimer.c:1932 __do_sys_nanosleep kernel/time/hrtimer.c:1966 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1953 [inline] __x64_sys_nanosleep+0x1dc/0x260 kernel/time/hrtimer.c:1953 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45af70 Code: c0 5b 5d c3 66 0f 1f 44 00 00 8b 04 24 48 83 c4 18 5b 5d c3 66 0f 1f 44 00 00 83 3d e1 ee 84 00 00 75 14 b8 23 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 d4 d1 fb ff c3 48 83 ec 08 e8 8a 46 00 00 RSP: 002b:00007fffc9f5b0a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000000d15b RCX: 000000000045af70 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fffc9f5b0b0 RBP: 0000000000000002 R08: 0000000000000001 R09: 0000000000f52940 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000015 R13: 00007fffc9f5b100 R14: 000000000000c84f R15: 00007fffc9f5b110 Allocated by task 94: 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 94: 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 ffff8881d213c8c0 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 212 bytes inside of 224-byte region [ffff8881d213c8c0, ffff8881d213c9a0) The buggy address belongs to the page: page:ffffea0007484f00 refcount:1 mapcount:0 mapping:0000000020d1398e 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: ffff8881d213c880: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8881d213c900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881d213c980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881d213ca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881d213ca80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================