linux-kernel - Re: [PATCH 4/5] drivers/char/agp: Eliminate memory leak

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Message-ID: <Pine.LNX.4.64.1008242220170.14009@ask.diku.dk>
Date:	Tue, 24 Aug 2010 22:20:45 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Dan Carpenter <error27@...il.com>
Cc:	David Airlie <airlied@...ux.ie>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/5] drivers/char/agp: Eliminate memory leak

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

alloc_pci_dev allocates some memory, so that memory should be freed before
leaving the function in an error case.

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

// <smpl>
@r exists@
local idexpression x;
expression E;
identifier f1;
iterator I;
@@

x = alloc_pci_dev(...);
<... when != x
     when != true (x == NULL || ...)
     when != if (...) { <+...x...+> }
     when != I (...) { <+...x...+> }
(
 x == NULL
|
 x == E
|
 x->f1
)
...>
* return ...;
// </smpl>

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

---
 drivers/char/agp/parisc-agp.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/char/agp/parisc-agp.c b/drivers/char/agp/parisc-agp.c
index 1c12921..17e380f 100644
--- a/drivers/char/agp/parisc-agp.c
+++ b/drivers/char/agp/parisc-agp.c
@@ -358,8 +358,12 @@ parisc_agp_setup(void __iomem *ioc_hpa, void __iomem *lba_hpa)
 	bridge->dev = fake_bridge_dev;
 
 	error = agp_add_bridge(bridge);
+	if (error)
+		goto fail;
+	return 0;
 
 fail:
+	kfree(fake_bridge_dev);
 	return error;
 }
 
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