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SubjectRe: KASAN: use-after-free Read in usb_kill_urb
On Fri, 9 Aug 2019, syzbot wrote:

> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger
> crash:
>
> Reported-and-tested-by:
> syzbot+22ae4e3b9fcc8a5c153a@syzkaller.appspotmail.com
>
> Tested on:
>
> commit: e96407b4 usb-fuzzer: main usb gadget fuzzer driver
> git tree: https://github.com/google/kasan.git
> kernel config: https://syzkaller.appspot.com/x/.config?x=cfa2c18fb6a8068e
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> patch: https://syzkaller.appspot.com/x/patch.diff?x=173f2d2c600000
>
> Note: testing is done by a robot and is best-effort only.

This shows that this bug is a duplicate of extid=30cf45ebfe0b0c4847a1.
This fact is also visible in the console logs; both have lines saying
something like:

[ 549.416341][ T22] sysfs: cannot create duplicate filename '/class/usbmisc/ldusb0'

and

[ 549.958755][ T22] ldusb 1-1:0.28: Not able to get a minor for this device.

preceding the invalid access.

Alan Stern

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