linux-kernel - Re: [PATCH v2] x86/PCI: fix a memory leak bug

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Date:   Wed, 17 Apr 2019 09:10:55 -0500
From:   Wenwen Wang <wang6495@....edu>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        "open list:PCI SUBSYSTEM" <linux-pci@...r.kernel.org>,
        "open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)" 
        <linux-kernel@...r.kernel.org>, Wenwen Wang <wang6495@....edu>
Subject: Re: [PATCH v2] x86/PCI: fix a memory leak bug

On Wed, Apr 17, 2019 at 12:58 AM Ingo Molnar <mingo@...nel.org> wrote:
>
>
> * Wenwen Wang <wang6495@....edu> wrote:
>
> > On Tue, Apr 16, 2019 at 3:33 PM Thomas Gleixner <tglx@...utronix.de> wrote:
> > >
> > > On Tue, 16 Apr 2019, Wenwen Wang wrote:
> > >
> > > > In pcibios_irq_init(), the PCI IRQ routing table 'pirq_table' is firstly
> > > > found through pirq_find_routing_table(). If the table is not found and
> > > > 'CONFIG_PCI_BIOS' is defined, the table is then allocated in
> > > > pcibios_get_irq_routing_table() using kmalloc(). In the following
> > > > execution, if the I/O APIC is used, this table is actually not used.
> > > > However, in that case, the allocated table is not freed, which can lead to
> > > > a memory leak bug.
> > >
> > > s/which can lead to/which is/
> > >
> > > There is no 'can'. It simply is a memory leak.
> > >
> > > > To fix this issue, this patch frees the allocated table if it is not used.
> > >
> > > To fix this issue, free the allocated table if it is not used.
> > >
> > > 'this patch' is completely redundant information and discouraged in
> > > Documentation/process/....
> > >
> >
> > Thanks for your suggestions, Thomas. I will revise the commit's message.
> >
> > Wenwen
> >
> > > Other than that:
> > >
> > > Acked-by: Thomas Gleixner <tglx@...utronix.de>
>
> You didn't add Thomas's Acked-by to your commit ...
>

I will add it and resubmit the patch.

Thanks,
Wenwen