diff mbox

drivers/atm/atmtcp.c: add missing atm_dev_put

Message ID Pine.LNX.4.64.1012291500310.8559@pc-004.diku.dk
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Julia Lawall Dec. 29, 2010, 2:01 p.m. UTC 
From: Julia Lawall <julia@diku.dk>

The earlier call to atm_dev_lookup increases the reference count of dev,
so decrease it on the way out.

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

// <smpl>
@@
expression x, E;
constant C;
@@

x = atm_dev_lookup(...);
... when != false x != NULL
    when != true x == NULL
    when != \(E = x\|x = E\)
    when != atm_dev_put(dev);
*return -C;
// </smpl>

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

---
 drivers/atm/atmtcp.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

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Comments

David Miller Dec. 31, 2010, 8:52 p.m. UTC | #1 
From: Julia Lawall <julia@diku.dk>
Date: Wed, 29 Dec 2010 15:01:03 +0100 (CET)

> From: Julia Lawall <julia@diku.dk>
> 
> The earlier call to atm_dev_lookup increases the reference count of dev,
> so decrease it on the way out.
> 
> The semantic match that finds this problem is as follows:
> (http://coccinelle.lip6.fr/)
 ...
> Signed-off-by: Julia Lawall <julia@diku.dk>

Applied, thank you.
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diff mbox

Patch

diff --git a/drivers/atm/atmtcp.c b/drivers/atm/atmtcp.c
index 2b464b6..0b06250 100644
--- a/drivers/atm/atmtcp.c
+++ b/drivers/atm/atmtcp.c
@@ -392,7 +392,10 @@  static int atmtcp_attach(struct atm_vcc *vcc,int itf)
 			atm_dev_put(dev);
 			return -EMEDIUMTYPE;
 		}
-		if (PRIV(dev)->vcc) return -EBUSY;
+		if (PRIV(dev)->vcc) {
+			atm_dev_put(dev);
+			return -EBUSY;
+		}
 	}
 	else {
 		int error;