linux-kernel - Re: [PATCH] PCI: mt7621: Fix possible string truncation in snprintf

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Message-ID: <CAMhs-H8zKEt9wxLiz1cKVXdasCR=oNtyvcDGp3ZNuF16vvZARg@mail.gmail.com>
Date: Thu, 11 Apr 2024 11:12:52 +0200
From: Sergio Paracuellos <sergio.paracuellos@...il.com>
To: linux-pci@...r.kernel.org
Cc: bhelgaas@...gle.com, lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org, 
	matthias.bgg@...il.com, angelogioacchino.delregno@...labora.com, 
	linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Bjorn Helgaas <helgaas@...nel.org>
Subject: Re: [PATCH] PCI: mt7621: Fix possible string truncation in snprintf

Hi,

On Fri, Feb 23, 2024 at 12:24 PM Sergio Paracuellos
<sergio.paracuellos@...il.com> wrote:
>
> Hi,
>
> On Thu, Jan 11, 2024 at 9:27 AM Sergio Paracuellos
> <sergio.paracuellos@...il.com> wrote:
> >
> > The following warning appears when driver is compiled with W=1.
> >
> > CC      drivers/pci/controller/pcie-mt7621.o
> > drivers/pci/controller/pcie-mt7621.c: In function ‘mt7621_pcie_probe’:
> > drivers/pci/controller/pcie-mt7621.c:228:49: error: ‘snprintf’ output may
> > be truncated before the last format character [-Werror=format-truncation=]
> > 228 |         snprintf(name, sizeof(name), "pcie-phy%d", slot);
> >     |                                                 ^
> > drivers/pci/controller/pcie-mt7621.c:228:9: note: ‘snprintf’ output between
> > 10 and 11 bytes into a destination of size 10
> > 228 |         snprintf(name, sizeof(name), "pcie-phy%d", slot);
> >     |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Clean this up increasing destination buffer one byte.
> >
> > Reported-by: Bjorn Helgaas <helgaas@...nel.org>
> > Closes: https://lore.kernel.org/linux-pci/20240110212302.GA2123146@bhelgaas/T/#t
> > Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
> > ---
> >  drivers/pci/controller/pcie-mt7621.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/pcie-mt7621.c b/drivers/pci/controller/pcie-mt7621.c
> > index 79e225edb42a..d97b956e6e57 100644
> > --- a/drivers/pci/controller/pcie-mt7621.c
> > +++ b/drivers/pci/controller/pcie-mt7621.c
> > @@ -202,7 +202,7 @@ static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
> >         struct mt7621_pcie_port *port;
> >         struct device *dev = pcie->dev;
> >         struct platform_device *pdev = to_platform_device(dev);
> > -       char name[10];
> > +       char name[11];
> >         int err;
> >
> >         port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
> > --
> > 2.25.1
> >
>
> Gentle ping on this patch :)

Another gentle ping on this patch :)

Thanks,
    Sergio Paracuellos