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| author | Steven Rostedt <rostedt@goodmis.org> | 2016-05-11 15:09:36 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-18 18:35:13 -0700 |
| commit | 9bd227fabce8cc260697ec1907342ae92473df06 (patch) | |
| tree | 30d51ddb4bb646cd1a2d453301c3b71372f782f8 | |
| parent | c9458953f34fc199b01d6d93848b3722c8bba04e (diff) | |
| download | lwn-9bd227fabce8cc260697ec1907342ae92473df06.tar.gz lwn-9bd227fabce8cc260697ec1907342ae92473df06.zip | |
tools lib traceevent: Do not reassign parg after collapse_tree()
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@goodmis.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Fixes: 42d6194d133c ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | tools/lib/traceevent/parse-filter.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c index 0144b3d1bb77..88cccea3ca99 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; - free(token); return 0; |