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    SubjectRe: BUG: bad usercopy in ld_usb_read
    On Thu, Aug 08, 2019 at 05:38:06AM -0700, syzbot wrote:
    > Hello,
    >
    > syzbot found the following crash on:
    >
    > HEAD commit: e96407b4 usb-fuzzer: main usb gadget fuzzer driver
    > git tree: https://github.com/google/kasan.git usb-fuzzer
    > console output: https://syzkaller.appspot.com/x/log.txt?x=13aeaece600000
    > kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e
    > dashboard link: https://syzkaller.appspot.com/bug?extid=45b2f40f0778cfa7634e
    > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
    >
    > Unfortunately, I don't have any reproducer for this crash yet.
    >
    > IMPORTANT: if you fix the bug, please add the following tag to the commit:
    > Reported-by: syzbot+45b2f40f0778cfa7634e@syzkaller.appspotmail.com
    >
    > ldusb 6-1:0.124: Read buffer overflow, -131383996186150 bytes dropped

    That's a funny number :)

    Nice overflow found, I see you are now starting to fuzz the char device
    nodes of usb drivers...

    Michael, care to fix this up?

    thanks,

    greg k-h

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