Bug#631287: BUG during access to hiddev (APC UPS)
Hello, colleagues,
On Sat, Nov 26, 2011 at 10:43 AM, Jonathan Nieder <jrnieder@gmail.com> wrote:
> Ben Hutchings wrote:
>> On Wed, 2011-06-22 at 19:24 +0400, Dmitry Eremin-Solenikov wrote:
>
>>> After upgrading to squeeze I've started receiving the following BUG in dmesg
>>> when apcupsd tries to access hid device for my UPS (APC SmartUPS 3000,
>>> connected via USB).
>> [...]
>>
>> There have been some changes to this driver in later versions that are
>> supposed to fix this. However it still looks like there are some broken
>> cases, so I'll try to deal with them as well rather than fixing only
>> part of the problem.
>
> v2.6.38-rc1~442^2~20 (HID: Fix race between disconnect and hiddev_ioctl,
> 2010-12-06) seems to follow a sane approach.
>
> Follow-up fixes:
>
> . v2.6.38-rc1~442^2~19 (HID: Consolidate device existence checks in
> hiddev_ioctl, 2010-12-06)
> . v3.0-rc1~345^2^3 (HID: hiddev: fix race between hiddev_disconnect and
> hiddev_release, 2011-05-20)
> . v3.0-rc4~20^2~6 (HID: hiddev: fix potential use-after-free,
> 2011-05-24)
> . v3.0-rc4~20^2~4 (HID: hiddev: fix use after free in hiddev_release,
> 2011-05-26)
>
> Dmitry, I assume you can still reproduce this. Could you try a 3.x.y
> kernel from sid? The only packages needed from outside squeeze aside
> from linux-image-3.1.0-1-686-pae itself are linux-base and
> initramfs-tools.
Unfortunately I cannot try reproducing this error, as I don't have access
to this hardware anymore. The problem was easily reproducible though
by using apcupsd together with any USB APC ups.
--
With best wishes
Dmitry
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