linux-kernel - [PATCH 4/5] drivers/parport/parport

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Date:	Mon,  4 Jul 2011 16:11:44 +0200
From:	Julia Lawall <julia@...u.dk>
To:	linux-kernel@...r.kernel.org
Cc:	kernel-janitors@...r.kernel.org
Subject: [PATCH 4/5] drivers/parport/parport_gsc.c: add missing kfree

From: Julia Lawall <julia@...u.dk>

ops was allocated previously in this function, so it should be freed before
leaving the function, as done in other nearby error-handling code.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier x;
@@

kfree(x)

@@
identifier r.x;
expression E1!=0,E2,E3,E4;
statement S;
@@

(
if (<+...x...+>) S
|
if (...) { ... when != kfree(x)
               when != if (...) { ... kfree(x); ... }
               when != x = E3
* return E1;
}
... when != x = E2
if (...) { ... when != x = E4
 kfree(x); ... return ...; }
)
// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 drivers/parport/parport_gsc.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/parport/parport_gsc.c b/drivers/parport/parport_gsc.c
index 5d6de38..352f961 100644
--- a/drivers/parport/parport_gsc.c
+++ b/drivers/parport/parport_gsc.c
@@ -271,6 +271,7 @@ struct parport *__devinit parport_gsc_probe_port (unsigned long base,
 	if (!parport_SPP_supported (p)) {
 		/* No port. */
 		kfree (priv);
+		kfree(ops);
 		return NULL;
 	}
 	parport_PS2_supported (p);

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