Re: [Industrypack-devel] [PATCH] Staging:ipack/carriers/tpci200: Fix a double free in tpci200_pci_probe

Mon, 26 Apr 2021 09:32:56 -0700 


> -----原始邮件-----
> 发件人: "Greg KH" <[email protected]>
> 发送时间: 2021-04-27 00:21:06 (星期二)
> 收件人: "Lv Yunlong" <[email protected]>
> 抄送: [email protected], [email protected], 
> [email protected], [email protected]
> 主题: Re: [PATCH] Staging:ipack/carriers/tpci200: Fix a double free in 
> tpci200_pci_probe
> 
> On Mon, Apr 26, 2021 at 08:35:47AM -0700, Lv Yunlong wrote:
> > In the out_err_bus_register error branch of tpci200_pci_probe,
> > tpci200->info->cfg_regs is freed by tpci200_uninstall()->
> > tpci200_unregister()->pci_iounmap(..,tpci200->info->cfg_regs)
> > in the first time.
> > 
> > But later, iounmap() is called to free tpci200->info->cfg_regs
> > again.
> > 
> > My patch sets tpci200->info->cfg_regs to NULL after tpci200_uninstall()
> > to avoid the double free.
> > 
> > Fixes: cea2f7cdff2af ("Staging: ipack/bridges/tpci200: Use the TPCI200 in 
> > big endian mode")
> > Signed-off-by: Lv Yunlong <[email protected]>
> > ---
> >  drivers/ipack/carriers/tpci200.c | 5 ++++-
> 
> This is not a staging driver, why does your subject line say that?
> 
> thanks,
> 
> greg k-h

I see the fixes cea2f7cdff2af has added the subsystem name in subject, so i 
guess
that the "Staging" may be an alias of this module. Sorry, i will name the 
subject
line more carefully in future.

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