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tools lib traceevent: Make sure that arg->op.right is set properly

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When process_op failed, @arg will be freed on a caller with type of
PRINT_OP.  Thus free_arg() will try to free ->op.right field which can
have stale value if something bad happens in the middle.

Signed-off-by: Namhyung Kim <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Namhyung Kim 2012-09-19 15:58:42 +09:00 • committed by Arnaldo Carvalho de Melo
commit 41e51a289b
1 changed files with 3 additions and 0 deletions
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3
tools/lib/traceevent/event-parse.c
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@ -1719,6 +1719,7 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok)
arg->op.left = left;
arg->op.prio = 0;
/* it will set arg->op.right */
type = process_cond(event, arg, tok);
} else if (strcmp(token, ">>") == 0 ||
@ -1745,6 +1746,7 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok)
arg->type = PRINT_OP;
arg->op.op = token;
arg->op.left = left;
arg->op.right = NULL;
if (set_op_prio(arg) == -1) {
event->flags |= EVENT_FL_FAILED;
@ -1792,6 +1794,7 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok)
arg->op.prio = 0;
/* it will set arg->op.right */
type = process_array(event, arg, tok);
} else {