[PATCH 4.2.y-ckt 23/53] tools lib traceevent: Do not reassign parg after collapse_tree()

From: Kamal Mostafa
Date: Tue May 24 2016 - 13:56:06 EST

4.2.8-ckt11 -stable review patch. If anyone has any objections, please let me know.


From: Steven Rostedt <rostedt@xxxxxxxxxxx>

commit 106b816cb46ebd87408b4ed99a2e16203114daa6 upstream.

At the end of process_filter(), collapse_tree() was changed to update
the parg parameter, but the reassignment after the call wasn't removed.

What happens is that the "current_op" gets modified and freed and parg
is assigned to the new allocated argument. But after the call to
collapse_tree(), parg is assigned again to the just freed "current_op",
and this causes the tool to crash.

The current_op variable must also be assigned to NULL in case of error,
otherwise it will cause it to be free()ed twice.

Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Fixes: 42d6194d133c ("tools lib traceevent: Refactor process_filter()")
Link: http://lkml.kernel.org/r/20160511150936.678c18a1@xxxxxxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
tools/lib/traceevent/parse-filter.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index 0144b3d..88cccea 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -1164,11 +1164,11 @@ process_filter(struct event_format *event, struct filter_arg **parg,
current_op = current_exp;

ret = collapse_tree(current_op, parg, error_str);
+ /* collapse_tree() may free current_op, and updates parg accordingly */
+ current_op = NULL;
if (ret < 0)
goto fail;

- *parg = current_op;
return 0;