tracing/filters: Don't use pred on alloc failure

Dan Carpenter sent me a fix to prevent pred from being used if
it couldn't be allocated.  I noticed the same problem also
existed for the create_pred() case and added a fix for that.

Reported-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <1249746549.6453.29.camel@tropicana>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 936c621..1557148 100644 (file)
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1029,6 +1029,8 @@ static int replace_preds(struct event_subsystem *system,
 
                if (elt->op == OP_AND || elt->op == OP_OR) {
                        pred = create_logical_pred(elt->op);
+                       if (!pred)
+                               return -ENOMEM;
                        if (call) {
                                err = filter_add_pred(ps, call, pred);
                                filter_free_pred(pred);
@@ -1048,6 +1050,8 @@ static int replace_preds(struct event_subsystem *system,
                }
 
                pred = create_pred(elt->op, operand1, operand2);
+               if (!pred)
+                       return -ENOMEM;
                if (call) {
                        err = filter_add_pred(ps, call, pred);
                        filter_free_pred(pred);