================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_read include/asm-generic/atomic-instrumented.h:27 [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:1046 [inline] BUG: KASAN: use-after-free in kfree_skb+0x2e/0x3f0 net/core/skbuff.c:692 Read of size 4 at addr ffff888014b7ed54 by task syz-executor.0/28422 CPU: 1 PID: 28422 Comm: syz-executor.0 Not tainted 5.10.0-rc3-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+0x107/0x163 lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x4c8 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_read include/linux/instrumented.h:71 [inline] atomic_read include/asm-generic/atomic-instrumented.h:27 [inline] refcount_read include/linux/refcount.h:147 [inline] skb_unref include/linux/skbuff.h:1046 [inline] kfree_skb+0x2e/0x3f0 net/core/skbuff.c:692 ath9k_hif_usb_reg_in_cb+0x4c0/0x630 drivers/net/wireless/ath/ath9k/hif_usb.c:764 __usb_hcd_giveback_urb+0x32d/0x560 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1716 dummy_timer+0x11f4/0x3280 drivers/usb/gadget/udc/dummy_hcd.c:1967 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x132/0x200 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:zap_pte_range mm/memory.c:1252 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1357 [inline] RIP: 0010:zap_pud_range mm/memory.c:1386 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1407 [inline] RIP: 0010:unmap_page_range+0xdf9/0x2640 mm/memory.c:1428 Code: 83 e3 01 89 de c1 e3 1f e8 b4 c2 ce ff c1 fb 1f 83 e3 03 e8 99 ca ce ff 48 63 db 48 83 fb 03 0f 87 b0 14 00 00 48 8b 44 24 40 <48> 8d 3c 98 48 89 f8 48 c1 e8 03 42 0f b6 14 30 48 89 f8 83 e0 07 RSP: 0018:ffffc9000320f9d8 EFLAGS: 00000293 RAX: ffffc9000320fad0 RBX: 0000000000000000 RCX: ffffffff81a14e9c RDX: ffff88806c188000 RSI: ffffffff81a14ea7 RDI: 0000000000000001 RBP: ffffea00008b5740 R08: 0000000000000000 R09: ffffea00008b5747 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff88802efc74a0 R14: dffffc0000000000 R15: 00007fd879e95000 unmap_single_vma+0x198/0x300 mm/memory.c:1473 unmap_vmas+0x168/0x2e0 mm/memory.c:1505 exit_mmap+0x2b1/0x530 mm/mmap.c:3222 __mmput+0x122/0x470 kernel/fork.c:1079 mmput+0x53/0x60 kernel/fork.c:1100 exit_mm kernel/exit.c:483 [inline] do_exit+0xa31/0x2930 kernel/exit.c:793 do_group_exit+0x125/0x310 kernel/exit.c:903 __do_sys_exit_group kernel/exit.c:914 [inline] __se_sys_exit_group kernel/exit.c:912 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:912 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: Unable to access opcode bytes at RIP 0x45de8f. RSP: 002b:000000000169fd88 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 000000000000001e RCX: 000000000045deb9 RDX: 0000000000417811 RSI: fffffffffffffff7 RDI: 0000000000000000 RBP: 0000000000000000 R08: 000000006e9499ad R09: 000000000169fde0 R10: ffffffff8127dcc0 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000169fde0 R14: 0000000000000000 R15: 000000000169fdf0 Allocated by task 9817: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:461 slab_post_alloc_hook mm/slab.h:526 [inline] slab_alloc_node mm/slub.c:2891 [inline] kmem_cache_alloc_node+0x132/0x480 mm/slub.c:2927 __alloc_skb+0x71/0x550 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1094 [inline] ath9k_hif_usb_alloc_reg_in_urbs drivers/net/wireless/ath/ath9k/hif_usb.c:957 [inline] ath9k_hif_usb_alloc_urbs+0x912/0x1010 drivers/net/wireless/ath/ath9k/hif_usb.c:1016 ath9k_hif_usb_dev_init drivers/net/wireless/ath/ath9k/hif_usb.c:1102 [inline] ath9k_hif_usb_firmware_cb+0x148/0x530 drivers/net/wireless/ath/ath9k/hif_usb.c:1235 request_firmware_work_func+0x12c/0x230 drivers/base/firmware_loader/main.c:1079 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Freed by task 28422: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x102/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1544 [inline] slab_free_freelist_hook+0x5d/0x150 mm/slub.c:1577 slab_free mm/slub.c:3142 [inline] kmem_cache_free+0x82/0x350 mm/slub.c:3158 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:622 __kfree_skb net/core/skbuff.c:679 [inline] kfree_skb net/core/skbuff.c:696 [inline] kfree_skb+0x140/0x3f0 net/core/skbuff.c:690 ath9k_htc_rx_msg+0x1eb/0xb70 drivers/net/wireless/ath/ath9k/htc_hst.c:451 ath9k_hif_usb_reg_in_cb+0x1ac/0x630 drivers/net/wireless/ath/ath9k/hif_usb.c:733 __usb_hcd_giveback_urb+0x32d/0x560 drivers/usb/core/hcd.c:1650 usb_hcd_giveback_urb+0x367/0x410 drivers/usb/core/hcd.c:1716 dummy_timer+0x11f4/0x3280 drivers/usb/gadget/udc/dummy_hcd.c:1967 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1410 expire_timers kernel/time/timer.c:1455 [inline] __run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1747 __run_timers kernel/time/timer.c:1728 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1760 __do_softirq+0x2a0/0x9f6 kernel/softirq.c:298 The buggy address belongs to the object at ffff888014b7ec80 which belongs to the cache skbuff_head_cache of size 224 The buggy address is located 212 bytes inside of 224-byte region [ffff888014b7ec80, ffff888014b7ed60) The buggy address belongs to the page: page:00000000f48c4391 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x14b7e flags: 0xfff00000000200(slab) raw: 00fff00000000200 ffffea00009b9a80 0000000400000004 ffff888010f33640 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888014b7ec00: 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc ffff888014b7ec80: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888014b7ed00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff888014b7ed80: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00 ffff888014b7ee00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================