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

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Date:   Tue, 16 Apr 2019 16:29:52 -0500
From:   Wenwen Wang <wang6495@....edu>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     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 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>