Re: [PATCH] [bpf] xdp_redirect_cpu_user: Fix null pointer dereference

[Daniel Borkmann <daniel@xxxxxxxxxxxxx>]

On 6/14/20 9:04 PM, Gaurav Singh wrote:
> Memset() on the pointer right after malloc() can cause
> a null pointer dereference if it failed to allocate memory.
> Fix this by replacing malloc/memset with a single calloc().
>
> Signed-off-by: Gaurav Singh <gaurav1086@xxxxxxxxx>

Squashed all three same fixes into one and pushed to bpf, thanks!

> @@ -222,11 +219,9 @@ static struct datarec *alloc_record_per_cpu(void)
>   static struct stats_record *alloc_stats_record(void)
>   {
>   	struct stats_record *rec;
> -	int i, size;
> +	int i;
>   
> -	size = sizeof(*rec) + n_cpus * sizeof(struct record);
> -	rec = malloc(size);
> -	memset(rec, 0, size);
> +	rec = calloc(n_cpus + 1, sizeof(struct record));

For the record, this one is buggy, so I fixed it up as well.

>   	if (!rec) {
>   		fprintf(stderr, "Mem alloc error\n");
>   		exit(EXIT_FAIL_MEM);

Thanks,
Daniel