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tools lib traceevent: Do not reassign parg after collapse_tree()

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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@goodmis.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org # 3.14+
Fixes: 42d6194d13 ("tools lib traceevent: Refactor process_filter()")
Link: http://lkml.kernel.org/r/20160511150936.678c18a1@gandalf.local.home
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Steven Rostedt 2016-05-11 15:09:36 -04:00 committed by Arnaldo Carvalho de Melo
parent 4924734570
commit 106b816cb4
1 changed files with 2 additions and 2 deletions
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4
tools/lib/traceevent/parse-filter.c
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@ -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;
free(token);
return 0;