linux-kernel - [PATCH 1/3] tracing/filter: degrade addr in filter_pred

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Date:   Fri,  7 Jan 2022 12:49:49 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Pingfan Liu <kernelfans@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Subject: [PATCH 1/3] tracing/filter: degrade addr in filter_pred_string() from double pointer to pointer

Since FILTER_PTR_STRING has the type of "char *", it is meaningless to
convert it to "char **". Hence degrading addr from double pointer to
single.

Signed-off-by: Pingfan Liu <kernelfans@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ingo Molnar <mingo@...hat.com>
To: linux-kernel@...r.kernel.org
---
 kernel/trace/trace_events_filter.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index c9124038b140..264456e1698f 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -670,11 +670,11 @@ static int filter_pred_string(struct filter_pred *pred, void *event)
 /* Filter predicate for char * pointers */
 static int filter_pred_pchar(struct filter_pred *pred, void *event)
 {
-	char **addr = (char **)(event + pred->offset);
+	char *addr = (char *)(event + pred->offset);
 	int cmp, match;
-	int len = strlen(*addr) + 1;	/* including tailing '\0' */
+	int len = strlen(addr) + 1;	/* including tailing '\0' */
 
-	cmp = pred->regex.match(*addr, &pred->regex, len);
+	cmp = pred->regex.match(addr, &pred->regex, len);
 
 	match = cmp ^ pred->not;
 
-- 
2.31.1