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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@cn.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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