[PATCH 1/1] ftrace: avoid duplicated function when writing set_graph_function

[Liming Wang]

Impact: fix a bug

when writing function to set_graph_function, we should check whether it
has existed in set_graph_function to avoid duplicating.

Signed-off-by: Liming Wang <liming.wang@xxxxxxxxxxxxx>
---
 kernel/trace/ftrace.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index eb57dc1..d2b1565 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1425,7 +1425,7 @@ ftrace_set_func(unsigned long *array, int idx, char *buffer)
 	struct dyn_ftrace *rec;
 	struct ftrace_page *pg;
 	int found = 0;
-	int i;
+	int i, j;
 
 	if (ftrace_disabled)
 		return -ENODEV;
@@ -1443,7 +1443,13 @@ ftrace_set_func(unsigned long *array, int idx, char *buffer)
 			kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
 			if (strcmp(str, buffer) == 0) {
 				found = 1;
-				array[idx] = rec->ip;
+				for (j = 0; j < idx; j++)
+					if (array[j] == rec->ip) {
+						found = 0;
+						break;
+					}
+				if (found)
+					array[idx] = rec->ip;
 				break;
 			}
 		}
-- 
1.6.0.3

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