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Subject[PATCH 1/6] drivers/dma: Correct use after free
From: Julia Lawall <julia@diku.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@diku.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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