linux-kernel - Re: BUG: KASAN: use-after-free in xhci_trb_virt_to

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Message-ID: <875zhlt3hg.fsf@kernel.org>
Date:   Thu, 09 Jan 2020 10:53:47 +0200
From:   Felipe Balbi <balbi@...nel.org>
To:     Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Paul Menzel <pmenzel@...gen.mpg.de>
Cc:     Greg KH <greg@...ah.com>, Mathias Nyman <mathias.nyman@...el.com>,
        linux-usb@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: BUG: KASAN: use-after-free in xhci_trb_virt_to_dma.part.24+0x1c/0x80


Hi,

Mika Westerberg <mika.westerberg@...ux.intel.com> writes:

> On Thu, Jan 02, 2020 at 03:10:14PM +0100, Paul Menzel wrote:
>> Mika, as you fixed the other leak, any idea, how to continue from the
>> kmemleak log below?
>> 
>> ```
>> unreferenced object 0xffff8c207a1e1408 (size 8):
>>   comm "systemd-udevd", pid 183, jiffies 4294667978 (age 752.292s)
>>   hex dump (first 8 bytes):
>>     34 01 05 00 00 00 00 00                          4.......
>>   backtrace:
>>     [<00000000aea7b46d>] xhci_mem_init+0xcfa/0xec0 [xhci_hcd]
>
> There are probably better ways for doing this but you can use objdump
> for example:
>
>   $ objdump -l --prefix-addresses -j .text --disassemble=xhci_mem_init drivers/usb/host/xhci-hcd.ko
>
> then find the offset xhci_mem_init+0xcfa. It should show you the line
> numbers as well if you have compiled your kernel with debug info. This
> should be close to the line that allocated the memory that was leaked.

addr2line helps here. So does gdb (gdb vmlinux l *(xhci_mem_init+0xcfa))

-- 
balbi

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