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SubjectRe: [PATCH] tracing: Fix a potential NULL dereference
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Hi Dan,

On Fri, 2018-03-23 at 14:37 +0300, Dan Carpenter wrote:
> We forgot to set the error code on this path so we return ERR_PTR(0)
> which is NULL. It results in a NULL dereference in the caller.
>
> Fixes: 100719dcef44 ("tracing: Add simple expression support to hist triggers")
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
> index 4f027642ceef..a02bc09d765a 100644
> --- a/kernel/trace/trace_events_hist.c
> +++ b/kernel/trace/trace_events_hist.c
> @@ -2776,6 +2776,7 @@ static struct hist_field *parse_expr(struct hist_trigger_data *hist_data,
> expr->fn = hist_field_plus;
> break;
> default:
> + ret = -EINVAL;
> goto free;
> }
>

Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>

Thanks for catching this!

Tom

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