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Message-ID: <Pine.LNX.4.64.0912222130370.28669@ask.diku.dk>
Date: Tue, 22 Dec 2009 21:30:59 +0100 (CET)
From: Julia Lawall <julia@...u.dk>
To: Dan Williams <dan.j.williams@...el.com>,
Maciej Sosnowski <maciej.sosnowski@...el.com>,
linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 1/6] drivers/dma: Correct use after free
From: Julia Lawall <julia@...u.dk>
Move the kfree after the iounmap that refers to the same structure.
A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)
// <smpl>
@@
expression x,e;
identifier f;
iterator I;
statement S;
@@
*kfree(x);
... when != &x
when != x = e
when != I(x,...) S
*x->f
// </smpl>
Signed-off-by: Julia Lawall <julia@...u.dk>
---
drivers/dma/coh901318.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/dma/coh901318.c b/drivers/dma/coh901318.c
index 4a99cd9..b5f2ee0 100644
--- a/drivers/dma/coh901318.c
+++ b/drivers/dma/coh901318.c
@@ -1294,8 +1294,8 @@ static int __exit coh901318_remove(struct platform_device *pdev)
dma_async_device_unregister(&base->dma_slave);
coh901318_pool_destroy(&base->pool);
free_irq(platform_get_irq(pdev, 0), base);
- kfree(base);
iounmap(base->virtbase);
+ kfree(base);
release_mem_region(pdev->resource->start,
resource_size(pdev->resource));
return 0;
--
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