Hello, syzbot found the following crash on: HEAD commit: e17994d1 usb: core: kcov: collect coverage from usb comple.. git tree: https://github.com/google/kasan.git usb-fuzzer console output: https://syzkaller.appspot.com/x/log.txt?x=15217373e00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60 dashboard link: https://syzkaller.appspot.com/bug?extid=a57b24d359dc5577634a compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a720ade00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1467b755e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+a57b24d359dc5577634a@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: use-after-free in memcpy include/linux/string.h:381 [inline] BUG: KASAN: use-after-free in skb_put_data include/linux/skbuff.h:2284 [inline] BUG: KASAN: use-after-free in hfa384x_int_rxmonitor drivers/staging/wlan-ng/hfa384x_usb.c:3412 [inline] BUG: KASAN: use-after-free in hfa384x_usbin_rx drivers/staging/wlan-ng/hfa384x_usb.c:3312 [inline] BUG: KASAN: use-after-free in hfa384x_usbin_callback+0x1993/0x2360 drivers/staging/wlan-ng/hfa384x_usb.c:3026 Read of size 34945 at addr ffff8881cda9f33c by task swapper/0/0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0xef/0x16e lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374 __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506 kasan_report+0xe/0x20 mm/kasan/common.c:641 check_memory_region_inline mm/kasan/generic.c:185 [inline] check_memory_region+0x152/0x1c0 mm/kasan/generic.c:192 memcpy+0x20/0x50 mm/kasan/common.c:127 memcpy include/linux/string.h:381 [inline] skb_put_data include/linux/skbuff.h:2284 [inline] hfa384x_int_rxmonitor drivers/staging/wlan-ng/hfa384x_usb.c:3412 [inline] hfa384x_usbin_rx drivers/staging/wlan-ng/hfa384x_usb.c:3312 [inline] hfa384x_usbin_callback+0x1993/0x2360 drivers/staging/wlan-ng/hfa384x_usb.c:3026 __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+0x1258/0x32ae drivers/usb/gadget/udc/dummy_hcd.c:1966 call_timer_fn+0x195/0x6f0 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers kernel/time/timer.c:1773 [inline] __run_timers kernel/time/timer.c:1740 [inline] run_timer_softirq+0x5f9/0x1500 kernel/time/timer.c:1786 __do_softirq+0x21e/0x950 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:1146 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829 </IRQ> RIP: 0010:default_idle+0x28/0x300 arch/x86/kernel/process.c:696 Code: cc cc 41 56 41 55 65 44 8b 2d 44 77 72 7a 41 54 55 53 0f 1f 44 00 00 e8 b6 62 b5 fb e9 07 00 00 00 0f 00 2d ea 0c 53 00 fb f4 <65> 44 8b 2d 20 77 72 7a 0f 1f 44 00 00 5b 5d 41 5c 41 5d 41 5e c3 RSP: 0018:ffffffff87007d80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: ffffffff8702cc40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffffff8702d48c RBP: fffffbfff0e05988 R08: ffffffff8702cc40 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff87e607c0 R15: 0000000000000000 cpuidle_idle_call kernel/sched/idle.c:154 [inline] do_idle+0x3e0/0x500 kernel/sched/idle.c:269 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:361 start_kernel+0xe16/0xe5a init/main.c:998 secondary_startup_64+0xb6/0xc0 arch/x86/kernel/head_64.S:242 The buggy address belongs to the page: page:ffffea000736a600 refcount:32769 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0 flags: 0x200000000010000(head) raw: 0200000000010000 dead000000000100 dead000000000122 0000000000000000 raw: 0000000000000000 0000000000000000 00008001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881cda9ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881cda9ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881cdaa0000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8881cdaa0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8881cdaa0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
