================================================================== BUG: KASAN: use-after-free in ath9k_htc_txcompletion_cb+0x285/0x2b0 drivers/net/wireless/ath/ath9k/htc_hst.c:341 Read of size 8 at addr ffff8881d0acaac8 by task systemd-udevd/6897 CPU: 0 PID: 6897 Comm: systemd-udevd 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 ath9k_htc_txcompletion_cb+0x285/0x2b0 drivers/net/wireless/ath/ath9k/htc_hst.c:341 hif_usb_regout_cb+0x115/0x1c0 drivers/net/wireless/ath/ath9k/hif_usb.c:90 __usb_hcd_giveback_urb+0x1f2/0x470 drivers/usb/core/hcd.c:1648 usb_hcd_giveback_urb+0x368/0x420 drivers/usb/core/hcd.c:1713 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:check_memory_region+0x16/0x1d0 mm/kasan/generic.c:192 Code: 00 0f 1f 00 48 89 f2 be f8 00 00 00 e9 33 4a 8d 00 0f 1f 00 48 85 f6 0f 84 72 01 00 00 49 89 fa 41 54 0f b6 d2 49 01 f2 55 53 <0f> 82 52 01 00 00 e9 b5 00 00 00 48 b8 00 00 00 00 00 00 00 ff 48 RSP: 0000:ffff8881c845fbf8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff8881cda04a40 RBX: 0000000000000001 RCX: ffffffff816541ed RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea00069e5040 RBP: ffffea00069e5040 R08: ffff8881cda04a40 R09: fffff94000d3ca09 R10: ffffea00069e5048 R11: fffff94000d3ca08 R12: ffffea00069e5040 R13: ffffea00069e5048 R14: ffffea00068f2b88 R15: ffffea00069e5040 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:110 [inline] PageSwapBacked include/linux/page-flags.h:348 [inline] PageSwapCache include/linux/page-flags.h:393 [inline] reuse_swap_page+0x38d/0x830 mm/swapfile.c:1664 do_wp_page+0x3b4/0x1af0 mm/memory.c:2955 handle_pte_fault mm/memory.c:4231 [inline] __handle_mm_fault+0x16e5/0x2da0 mm/memory.c:4345 handle_mm_fault+0x2ec/0x8d0 mm/memory.c:4382 do_user_addr_fault arch/x86/mm/fault.c:1464 [inline] do_page_fault+0x51e/0x127d arch/x86/mm/fault.c:1535 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203 RIP: 0033:0x7f0fc7941bba Code: 00 00 00 00 e9 af fe ff ff 0f 1f 80 00 00 00 00 be 01 00 00 00 44 89 e0 83 3d 51 6b 32 00 00 74 09 f0 0f b1 75 00 75 08 eb 1d <0f> b1 75 00 74 17 48 8d 7d 00 48 81 ec 80 00 00 00 e8 e0 d8 07 00 RSP: 002b:00007fff804eef80 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 000055e5b656dd70 RCX: 00000000000000f0 RDX: fffffffffffffef0 RSI: 0000000000000001 RDI: 00007f0fc7c63b00 RBP: 00007f0fc7c63b00 R08: 00000000ffffffff R09: 000000000000000f R10: 00007f0fc794b220 R11: 000055e5b48bd9a0 R12: 0000000000000000 R13: 0000000000000110 R14: 000055e5b655b010 R15: 000055e5b655b028 Allocated by task 3117: 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 3117: 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 ffff8881d0acaa00 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 200 bytes inside of 224-byte region [ffff8881d0acaa00, ffff8881d0acaae0) The buggy address belongs to the page: page:ffffea000742b280 refcount:1 mapcount:0 mapping:00000000ff993d3b index:0x0 flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea0007303e40 0000000600000003 ffff8881da175400 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881d0aca980: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ffff8881d0acaa00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881d0acaa80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8881d0acab00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8881d0acab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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