Commit 47348e3f authored by Steven Rostedt's avatar Steven Rostedt Committed by Sasha Levin

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

[ Upstream commit 106b816c ]

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: default avatarSteven Rostedt <rostedt@goodmis.org>
Acked-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org # 3.14+
Fixes: 42d6194d ("tools lib traceevent: Refactor process_filter()")
Link: http://lkml.kernel.org/r/20160511150936.678c18a1@gandalf.local.homeSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: default avatarSasha Levin <sasha.levin@oracle.com>
parent 6f241606
......@@ -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;
......
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