Re: [PATCH v3] proc/vmcore: fix potential memory leak in vmcore_init()

Baoquan He
2022-07-11T07:50:05Z

On 07/11/22 at 03:34pm, 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.
>
> Signed-off-by: Jianglei Nie <niejianglei2021@163.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..125efe63f281 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;

Sigh. Why don't you copy my suggested code directly?

> }
> elfcorehdr_free(elfcorehdr_addr);

Remove above line.

> elfcorehdr_addr = ELFCORE_ADDR_ERR;
> @@ -1578,6 +1578,9 @@ static int __init vmcore_init(void)
> if (proc_vmcore)
> proc_vmcore->size = vmcore_size;
> return 0;

Remove above line too.

> +fail:
> + elfcorehdr_free(elfcorehdr_addr);
> + return rc;
> }
> fs_initcall(vmcore_init);
>
> --
> 2.25.1
>