linux-kernel - [PATCH 3.12 104/111] NFC: pn533: fix error return code

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Date:	Wed, 10 Jun 2015 17:27:33 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 104/111] NFC: pn533: fix error return code

From: Julia Lawall <Julia.Lawall@...6.fr>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 5df848f37b1d20e5dd64bea16ba9f69ed321e11b upstream.

Return a negative error code on failure.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier ret; expression e1,e2;
@@
(
if (\(ret < 0\|ret != 0\))
 { ... return ret; }
|
ret = 0
)
... when != ret = e1
    when != &ret
*if(...)
{
  ... when != ret = e2
      when forall
 return ret;
}
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
Signed-off-by: Samuel Ortiz <sameo@...ux.intel.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/nfc/pn533.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nfc/pn533.c b/drivers/nfc/pn533.c
index 5df730be88a3..30e50987b8df 100644
--- a/drivers/nfc/pn533.c
+++ b/drivers/nfc/pn533.c
@@ -2352,8 +2352,10 @@ static int pn533_data_exchange_complete(struct pn533 *dev, void *_arg,
 	}
 
 	skb = pn533_build_response(dev);
-	if (!skb)
+	if (!skb) {
+		rc = -ENOMEM;
 		goto error;
+	}
 
 	arg->cb(arg->cb_context, skb, 0);
 	kfree(arg);
-- 
2.4.2

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