linux-kernel - Re: [PATCH v2] proc/vmcore: fix potential memory leak in vmcore

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Date:   Fri, 8 Jul 2022 16:34:43 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Jianglei Nie <niejianglei2021@....com>, akpm@...ux-foundation.org
Cc:     vgoyal@...hat.com, dyoung@...hat.com, kexec@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v2] proc/vmcore: fix potential memory leak in
 vmcore_init()

On 07/04/22 at 04:18pm, Jianglei Nie wrote:
> elfcorehdr_alloc() allocates a memory chunk for elfcorehdr_addr with
> kzalloc(). If is_vmcore_usable() returns false, elfcorehdr_addr is a
> predefined value. If parse_crash_elf_headers() occurs some error and
> returns a negetive value, the elfcorehdr_addr should be released with
> elfcorehdr_free().
> 
> We can fix by calling elfcorehdr_free() when parse_crash_elf_headers()
> fails.

LGTM,

Acked-by: Baoquan He <bhe@...hat.com>

> 
> Signed-off-by: Jianglei Nie <niejianglei2021@....com>
> ---
>  fs/proc/vmcore.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
> index 4eaeb645e759..86887bd90263 100644
> --- a/fs/proc/vmcore.c
> +++ b/fs/proc/vmcore.c
> @@ -1569,7 +1569,7 @@ static int __init vmcore_init(void)
>  	rc = parse_crash_elf_headers();
>  	if (rc) {
>  		pr_warn("Kdump: vmcore not initialized\n");
> -		return rc;
> +		goto fail;
>  	}
>  	elfcorehdr_free(elfcorehdr_addr);
>  	elfcorehdr_addr = ELFCORE_ADDR_ERR;
> @@ -1577,6 +1577,9 @@ static int __init vmcore_init(void)
>  	proc_vmcore = proc_create("vmcore", S_IRUSR, NULL, &vmcore_proc_ops);
>  	if (proc_vmcore)
>  		proc_vmcore->size = vmcore_size;
> +
> +fail:
> +	elfcorehdr_free(elfcorehdr_addr);
>  	return 0;
>  }
>  fs_initcall(vmcore_init);
> -- 
> 2.25.1
>