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@xxxxxxxxxx>
>
> Signed-off-by: Jianglei Nie <niejianglei2021@xxxxxxx>
> ---
> 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
>
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