Re: [PATCH] staging: lustre: llite: Fix variable length array warning

[Joe Perches]

On Thu, 2017-05-04 at 23:41 -0700, Guru Das Srinagesh wrote:
> Fix sparse warning "warning: Variable length array is used." by using
> kmalloc_array to allocate the required amount of memory instead and
> kfree to deallocate memory after use.
[]
> diff --git a/drivers/staging/lustre/lustre/llite/xattr.c b/drivers/staging/lustre/lustre/llite/xattr.c
[]
> @@ -86,7 +86,8 @@ ll_xattr_set_common(const struct xattr_handler *handler,
>  		    const char *name, const void *value, size_t size,
>  		    int flags)
>  {
> -	char fullname[strlen(handler->prefix) + strlen(name) + 1];
> +	int fullname_len = strlen(handler->prefix) + strlen(name) + 1;
> +	char *fullname = kmalloc_array(fullname_len, sizeof(char), GFP_KERNEL);

What happens when this allocation fails?