linux-kernel - [PATCH 2/9] ftrace: Fix possible NULL dereferencing in __ftrace_hash_rec

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Date:	Sun, 27 Nov 2011 19:04:27 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	paulus@...ba.org, acme@...stprotocols.net
Cc:	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>
Subject: [PATCH 2/9] ftrace: Fix possible NULL dereferencing in __ftrace_hash_rec_update

We need to check the existence of the other_hash before
we touch its count variable.

This issue is hit only when non global ftrace_ops is used.
The global ftrace_ops is initialized with empty hashes.

Signed-off-by: Jiri Olsa <jolsa@...hat.com>
---
 kernel/trace/ftrace.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index b1e8943..c6d0293 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1372,7 +1372,8 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
 			if (filter_hash && in_hash && !in_other_hash)
 				match = 1;
 			else if (!filter_hash && in_hash &&
-				 (in_other_hash || !other_hash->count))
+				 (in_other_hash ||
+				  !other_hash || !other_hash->count))
 				match = 1;
 		}
 		if (!match)
-- 
1.7.1

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