linux-kernel - [PATCH 1/2] tracing/filters: strloc should be unsigned short

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Message-ID: <4A1F9FA6.3030906@cn.fujitsu.com>
Date:	Fri, 29 May 2009 16:41:10 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, Tom Zanussi <tzanussi@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] tracing/filters: strloc should be unsigned short

I forgot to update filter code accordingly in
"tracing/events: change the type of __str_loc_item to unsigned short"
(commt b0aae68cc5508f3c2fbf728988c954db4c8b8a53)

It can cause system crash:

 # echo 1 > tracing/events/irq/irq_handler_entry/enable
 # echo 'name == eth0' > /mnt/tracing/events/irq/irq_handler_entry/filter

[ Impact: fix system crash while filtering on __string() field ]

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 kernel/trace/trace_events_filter.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index a7430b1..a854eed 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -178,7 +178,7 @@ static int filter_pred_string(struct filter_pred *pred, void *event,
 static int filter_pred_strloc(struct filter_pred *pred, void *event,
 			      int val1, int val2)
 {
-	int str_loc = *(int *)(event + pred->offset);
+	unsigned short str_loc = *(unsigned short *)(event + pred->offset);
 	char *addr = (char *)(event + str_loc);
 	int cmp, match;
 
-- 
1.5.4.rc3

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