linux-kernel - [PATCH 4/5] drivers/media/video/atmel-isi.c: eliminate a null pointer dereference

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Date:	Sat, 29 Oct 2011 01:58:16 +0200
From:	Julia Lawall <julia@...u.dk>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	kernel-janitors@...r.kernel.org, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/5] drivers/media/video/atmel-isi.c: eliminate a null pointer dereference

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

The variable isi might be null or might be freed at the point of the call
to clk_put.  pclk contains the value that isi->pclk is expected to point to.

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

// <smpl>
@r@
expression E, E1;
identifier f;
statement S1,S2,S3;
@@

if (E == NULL)
{
  ... when != if (E == NULL || ...) S1 else S2
      when != E = E1
*E->f
  ... when any
  return ...;
}
else S3
// </smpl>

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

---
 drivers/media/video/atmel-isi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/video/atmel-isi.c b/drivers/media/video/atmel-isi.c
index 774715d..a3dafd6 100644
--- a/drivers/media/video/atmel-isi.c
+++ b/drivers/media/video/atmel-isi.c
@@ -1026,7 +1026,7 @@ err_alloc_ctx:
 err_alloc_descriptors:
 	kfree(isi);
 err_alloc_isi:
-	clk_put(isi->pclk);
+	clk_put(pclk);
 
 	return ret;
 }

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