linux-kernel - Re: [PATCH v12 3/4] arm64: Free DTB buffer if fdt_open

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Message-ID: <50e52d9b-db37-f95b-7056-d90476475fd9@linux.microsoft.com>
Date:   Thu, 17 Dec 2020 10:30:29 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     zohar@...ux.ibm.com, bauerman@...ux.ibm.com, robh@...nel.org,
        takahiro.akashi@...aro.org, gregkh@...uxfoundation.org,
        will@...nel.org, catalin.marinas@....com, mpe@...erman.id.au
Cc:     james.morse@....com, sashal@...nel.org, benh@...nel.crashing.org,
        paulus@...ba.org, frowand.list@...il.com,
        vincenzo.frascino@....com, mark.rutland@....com,
        dmitry.kasatkin@...il.com, jmorris@...ei.org, serge@...lyn.com,
        pasha.tatashin@...een.com, allison@...utok.net,
        masahiroy@...nel.org, bhsharma@...hat.com, mbrugger@...e.com,
        hsinyi@...omium.org, tao.li@...o.com, christophe.leroy@....fr,
        prsriva@...ux.microsoft.com, balajib@...ux.microsoft.com,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v12 3/4] arm64: Free DTB buffer if fdt_open_into() fails

On 12/17/20 9:37 AM, Lakshmi Ramasubramanian wrote:
> create_dtb() function allocates memory for the device tree blob (DTB)
> and calls fdt_open_into(). If this call fails the memory allocated
> for the DTB is not freed before returning from create_dtb() thereby
> leaking memory.

Typo in the email address of James Morse (ARM.com). Sorry about that.
Adding the correct email address.

  -lakshmi

> 
> Call vfree() to free the memory allocated for the DTB if fdt_open_into()
> fails.
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
> ---
>   arch/arm64/kernel/machine_kexec_file.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c
> index 7de9c47dee7c..3e045cd62451 100644
> --- a/arch/arm64/kernel/machine_kexec_file.c
> +++ b/arch/arm64/kernel/machine_kexec_file.c
> @@ -65,8 +65,10 @@ static int create_dtb(struct kimage *image,
>   
>   		/* duplicate a device tree blob */
>   		ret = fdt_open_into(initial_boot_params, buf, buf_size);
> -		if (ret)
> +		if (ret) {
> +			vfree(buf);
>   			return -EINVAL;
> +		}
>   
>   		ret = of_kexec_setup_new_fdt(image, buf, initrd_load_addr,
>   					     initrd_len, cmdline);
>