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Date: Thu, 18 Apr 2019 10:18:51 -0500 From: Tom Zanussi <zanussi@...nel.org> To: rostedt@...dmis.org Cc: vincent@...nat.ch, linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org Subject: [PATCH v2 2/3] tracing: Check keys for variable references in expressions too From: Tom Zanussi <tom.zanussi@...ux.intel.com> There's an existing check for variable references in keys, but it doesn't go far enough. It checks whether a key field is a variable reference but doesn't check whether it's an expression containing variable references, which can cause the same problems for callers. Use the existing field_has_hist_vars() function rather than a direct top-level flag check to catch all possible variable references. Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com> Reported-by: Vincent Bernat <vincent@...nat.ch> --- kernel/trace/trace_events_hist.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index 453f51ef83ca..cb56c7c456fa 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -59,7 +59,7 @@ C(NO_CLOSING_PAREN, "No closing paren found"), \ C(SUBSYS_NOT_FOUND, "Missing subsystem"), \ C(INVALID_SUBSYS_EVENT, "Invalid subsystem or event name"), \ - C(INVALID_REF_KEY, "Using variable references as keys not supported"), \ + C(INVALID_REF_KEY, "Using variable references in keys not supported"), \ C(VAR_NOT_FOUND, "Couldn't find variable"), \ C(FIELD_NOT_FOUND, "Couldn't find field"), @@ -4506,7 +4506,7 @@ static int create_key_field(struct hist_trigger_data *hist_data, goto out; } - if (hist_field->flags & HIST_FIELD_FL_VAR_REF) { + if (field_has_hist_vars(hist_field, 0)) { hist_err(tr, HIST_ERR_INVALID_REF_KEY, errpos(field_str)); destroy_hist_field(hist_field, 0); ret = -EINVAL; -- 2.14.1
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