Re: KASAN: slab-out-of-bounds Read in edge_interrupt_callback

[Qiujun Huang]

#syz test: https://github.com/google/kasan.git e17994d1

On Mon, Mar 23, 2020 at 8:40 PM syzbot
<syzbot+37ba33391ad5f3935bbd@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> 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=13706939e00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60
> dashboard link: https://syzkaller.appspot.com/bug?extid=37ba33391ad5f3935bbd
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=150d3841e00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12842b19e00000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+37ba33391ad5f3935bbd@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in edge_interrupt_callback+0x8be/0x9d0 drivers/usb/serial/io_edgeport.c:715
> Read of size 1 at addr ffff8881d2920c67 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
>  edge_interrupt_callback+0x8be/0x9d0 drivers/usb/serial/io_edgeport.c:715
>  __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
>
>
> ---
> 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@xxxxxxxxxxxxxxxxx
>
> syzbot will keep track of this bug report. See:
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> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches

Attachment: 0003-USB-io_edgeport-fix-slab-out-of-bounds-Read-in-edge_.patch
Description: Binary data