Messages in this thread | | | From | Zheng Hacker <> | Date | Thu, 13 Apr 2023 16:07:49 +0800 | Subject | Re: [PATCH] misc: hisi_hikey_usb: Fix use after free bug in hisi_hikey_usb_remove due to race condition |
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Friendly ping about the bug.
Thanks, Zheng
Zheng Hacker <hackerzheng666@gmail.com> 于2023年3月14日周二 09:01写道: > > John Stultz <jstultz@google.com> 于2023年3月14日周二 03:57写道: > > > > On Sun, Mar 12, 2023 at 7:53 AM Zheng Wang <zyytlz.wz@163.com> wrote: > > > > > > In hisi_hikey_usb_probe, it called hisi_hikey_usb_of_role_switch > > > and bound &hisi_hikey_usb->work with relay_set_role_switch. > > > When it calls hub_usb_role_switch_set, it will finally call > > > schedule_work to start the work. > > > > > > When we call hisi_hikey_usb_remove to remove the driver, there > > > may be a sequence as follows: > > > > > > Fix it by finishing the work before cleanup in hisi_hikey_usb_remove. > > > > > > CPU0 CPU1 > > > > > > |relay_set_role_switch > > > hisi_hikey_usb_remove| > > > usb_role_switch_put| > > > usb_role_switch_release | > > > kfree(sw) | > > > | usb_role_switch_set_role > > > | //use > > > > > > Fixes: 7a6ff4c4cbc3 ("misc: hisi_hikey_usb: Driver to support onboard USB gpio hub on Hikey960") > > > Signed-off-by: Zheng Wang <zyytlz.wz@163.com> > > > --- > > > drivers/misc/hisi_hikey_usb.c | 1 + > > > 1 file changed, 1 insertion(+) > > > > > > diff --git a/drivers/misc/hisi_hikey_usb.c b/drivers/misc/hisi_hikey_usb.c > > > index 2165ec35a343..26fc895c4418 100644 > > > --- a/drivers/misc/hisi_hikey_usb.c > > > +++ b/drivers/misc/hisi_hikey_usb.c > > > @@ -242,6 +242,7 @@ static int hisi_hikey_usb_probe(struct platform_device *pdev) > > > static int hisi_hikey_usb_remove(struct platform_device *pdev) > > > { > > > struct hisi_hikey_usb *hisi_hikey_usb = platform_get_drvdata(pdev); > > > + cancel_work_sync(&hisi_hikey_usb->work); > > > > > > if (hisi_hikey_usb->hub_role_sw) { > > > usb_role_switch_unregister(hisi_hikey_usb->hub_role_sw); > > > > Looks sane to me. > > Pulling in Sumit and YongQin as they have hardware and can test with it. > > > Hi John, > > Thanks for your reply. Thank Sumit and YongQin for being willing to > test the solution with their hardware. > > Best regards, > Zheng
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