linux-kernel - [2.6.31 PATCH] tracing/filters: don't use pred on alloc failure

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Date:	Sat, 08 Aug 2009 10:49:09 -0500
From:	Tom Zanussi <tzanussi@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Dan Carpenter <error27@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Li Zefan <lizf@...fujitsu.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [2.6.31 PATCH] 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.

Signed-off-by: Tom Zanussi <tzanussi@...il.com>

The original report:

create_logical_pred() could sometimes return NULL.

It's a static checker complaining rather than problems at runtime...

Signed-off-by: Dan Carpenter <error27@...il.com>
---
 kernel/trace/trace_events_filter.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 936c621..1557148 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);
-- 
1.5.6.3



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