================================================================== 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 ffff8881c714f714 by task syz-executor.1/389 CPU: 1 PID: 389 Comm: syz-executor.1 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:__kasan_check_read+0x0/0x10 mm/kasan/common.c:72 Code: c7 80 2d df 86 e8 b9 9a c0 ff 48 c7 c7 b0 2d df 86 e8 ad 9a c0 ff e9 bf e9 ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <48> 8b 0c 24 89 f6 31 d2 e9 83 25 00 00 0f 1f 00 48 8b 0c 24 89 f6 RSP: 0018:ffff8881adbef778 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffff8881db335680 RCX: 1ffffffff0fd1376 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8881db335758 RBP: ffff8881db335758 R08: 0000000000000001 R09: fffffbfff126c8c9 R10: ffffffff89364647 R11: fffffbfff126c8c8 R12: ffffffff817b0962 R13: ffffffff817b0962 R14: 0000000000000246 R15: ffffea0006a367c8 atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:302 [inline] rcu_is_watching+0x2c/0x80 kernel/rcu/tree.c:929 rcu_read_lock_held_common+0xc2/0x170 kernel/rcu/update.c:104 rcu_read_lock_sched_held+0x5a/0xd0 kernel/rcu/update.c:119 trace_kmem_cache_free include/trace/events/kmem.h:145 [inline] kmem_cache_free+0x2cf/0x360 mm/slub.c:3062 free_buffer_head+0x42/0xa0 fs/buffer.c:3363 try_to_free_buffers+0x235/0x3d0 fs/buffer.c:3277 ext4_releasepage+0x350/0x440 fs/ext4/inode.c:3294 try_to_release_page+0x1b7/0x260 mm/filemap.c:3498 block_invalidatepage+0x424/0x4a0 fs/buffer.c:1546 do_invalidatepage mm/truncate.c:163 [inline] truncate_cleanup_page+0xf9/0x2d0 mm/truncate.c:185 truncate_inode_pages_range+0x563/0x1260 mm/truncate.c:365 ext4_evict_inode+0x4d9/0x13c0 fs/ext4/inode.c:221 evict+0x2ed/0x650 fs/inode.c:576 iput_final fs/inode.c:1572 [inline] iput+0x4f4/0x880 fs/inode.c:1598 do_unlinkat+0x3f6/0x650 fs/namei.c:3879 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45c817 Code: 00 66 90 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 4d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 2d b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc17fd6168 EFLAGS: 00000246 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000045c817 RDX: 00007ffc17fd6180 RSI: 00007ffc17fd6180 RDI: 00007ffc17fd6210 RBP: 000000000000001f R08: 0000000000000000 R09: 0000000000000006 R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffc17fd72a0 R13: 0000000001e44940 R14: 0000000000000000 R15: 00007ffc17fd72a0 Allocated by task 21: 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 21: 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 ffff8881c714f640 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 212 bytes inside of 224-byte region [ffff8881c714f640, ffff8881c714f720) The buggy address belongs to the page: page:ffffea00071c53c0 refcount:1 mapcount:0 mapping:00000000a073dd5e index:0x0 flags: 0x200000000000200(slab) raw: 0200000000000200 ffffea0007353380 0000000800000008 ffff8881da175400 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881c714f600: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff8881c714f680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8881c714f700: fb fb fb fb fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff8881c714f780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881c714f800: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc 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