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tracing: Fix a potential NULL dereference

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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.

Link: http://lkml.kernel.org/r/20180323113735.GC28518@mwanda

Fixes: 100719dcef ("tracing: Add simple expression support to hist triggers")
Acked-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Dan Carpenter 2018-03-23 14:37:36 +03:00 committed by Steven Rostedt (VMware)
parent 80765597bc
commit 5e4cf2bf6d
1 changed files with 1 additions and 0 deletions
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kernel/trace/trace_events_hist.c
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@ -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;
}