From: Tom Zanussi <tzanussi@gmail.com>
Date: Sat, 8 Aug 2009 15:49:09 +0000 (-0500)
Subject: tracing/filters: Don't use pred on alloc failure
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=96b2de313b1e0e02aea80ee47df6a2b5cbdf8e13;p=linux-beck.git

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 936c621bbf46..1557148be34b 100644
--- 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);