linux-kernel - [PATCH] tracing/filters: disallow integer values for string filters and vice versa

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Date:	Tue, 24 Mar 2009 02:14:42 -0500
From:	Tom Zanussi <tzanussi@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
Subject: [PATCH] tracing/filters: disallow integer values for string
	filters and vice versa

Make sure filters for string fields don't use integer values and vice
versa.  Getting it wrong can crash the system or produce bogus
results.  

Signed-off-by: Tom Zanussi <tzanussi@...il.com>

---
 kernel/trace/trace_events_filter.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 9fca8bb..026be41 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -237,9 +237,14 @@ int filter_add_pred(struct ftrace_event_call *call, struct filter_pred *pred)
 	pred->offset = field->offset;
 
 	if (is_string_field(field->type)) {
+		if (!pred->str_val)
+			return -EINVAL;
 		pred->fn = filter_pred_string;
 		pred->str_len = field->size;
 		return __filter_add_pred(call, pred);
+	} else {
+		if (pred->str_val)
+			return -EINVAL;
 	}
 
 	switch (field->size) {
-- 
1.5.6.3



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