linux-kernel - [PATCH] i2c: add sanity check to i2c_put

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Message-Id: <1375359046-17472-1-git-send-email-sebastian.hesselbarth@gmail.com>
Date:	Thu,  1 Aug 2013 14:10:46 +0200
From:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: add sanity check to i2c_put_adapter

i2c_put_adapter dereferences i2c_adapter pointer passed without check
for NULL. This adds a check for non-NULL pointer to allow i2c_put_adapter
called with NULL and behave the same way i2c_release_client does already.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
---
Cc: Wolfram Sang <wsa@...-dreams.de>
Cc: linux-i2c@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/i2c/i2c-core.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index f32ca29..d075df6 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1825,7 +1825,8 @@ EXPORT_SYMBOL(i2c_get_adapter);
 
 void i2c_put_adapter(struct i2c_adapter *adap)
 {
-	module_put(adap->owner);
+	if (adap)
+		module_put(adap->owner);
 }
 EXPORT_SYMBOL(i2c_put_adapter);
 
-- 
1.7.10.4

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