linux-kernel - Re: [PATCH] PCI: rockchip: fix uninitialized variable use

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <440300d4-1d96-4f38-870b-c026b8fb5b2c@rock-chips.com>
Date:   Fri, 23 Sep 2016 08:15:05 +0800
From:   Shawn Lin <shawn.lin@...k-chips.com>
To:     Arnd Bergmann <arnd@...db.de>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     shawn.lin@...k-chips.com, Wenrui Li <wenrui.li@...k-chips.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Brian Norris <briannorris@...omium.org>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: rockchip: fix uninitialized variable use

Hi Arnd,

在 2016/9/22 17:39, Arnd Bergmann 写道:
> The newly added pcie-rockchip driver fails to initialize the
> io_size variable if the DT doesn't provide ranges for the PCI
> I/O space, as found by building it with -Wmaybe-uninitialized:
>
> drivers/pci/host/pcie-rockchip.c: In function 'rockchip_pcie_probe':
> drivers/pci/host/pcie-rockchip.c:1007:6: warning: 'io_size' may be used uninitialized in this function [-Wmaybe-uninitialized]
>

Seems like we miss this when refactoring the code a bit.
Thanks for fixing it.

Acked-by: Shawn Lin <shawn.lin@...k-chips.com>

> This adds an appropriate initialization immediately in front of
> the loop, so the io_size is zero as expected afterwards for that
> case.
>
> Fixes: abe17181b16f ("PCI: rockchip: Add Rockchip PCIe controller support")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/pci/host/pcie-rockchip.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
> index c3593e633ccd..8bedc1e1ef80 100644
> --- a/drivers/pci/host/pcie-rockchip.c
> +++ b/drivers/pci/host/pcie-rockchip.c
> @@ -1078,6 +1078,7 @@ static int rockchip_pcie_probe(struct platform_device *pdev)
>  		goto err_vpcie;
>
>  	/* Get the I/O and memory ranges from DT */
> +	io_size = 0;
>  	resource_list_for_each_entry(win, &res) {
>  		switch (resource_type(win->res)) {
>  		case IORESOURCE_IO:
>


-- 
Best Regards
Shawn Lin