diff mbox

[04/11] drivers/media/video: avoid NULL dereference

Message ID 201004272111.o3RLBM13019988@imap1.linux-foundation.org (mailing list archive)
State Superseded, archived
Headers

Commit Message

Andrew Morton April 27, 2010, 9:11 p.m. UTC 
  From: Julia Lawall <julia@diku.dk>

It seems impossible for ov to be NULL at this point.

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

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

if ((E == NULL && ...) || ...)
{
  ... when != false ((E == NULL && ...) || ...)
      when != true  ((E != NULL && ...) || ...)
      when != iter(E,...) S1
      when != E = E1
(
  sizeof(E->f)
|
* E->f
)
  ... when any
  return ...;
}
else S3
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Mark McClelland <mmcclell@bigfoot.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/media/video/ov511.c |    5 -----
 1 file changed, 5 deletions(-)
diff mbox

Patch

diff -puN drivers/media/video/ov511.c~drivers-media-video-avoid-null-dereference drivers/media/video/ov511.c
--- a/drivers/media/video/ov511.c~drivers-media-video-avoid-null-dereference
+++ a/drivers/media/video/ov511.c
@@ -5916,11 +5916,6 @@  ov51x_disconnect(struct usb_interface *i
 	mutex_lock(&ov->lock);
 	usb_set_intfdata (intf, NULL);
 
-	if (!ov) {
-		mutex_unlock(&ov->lock);
-		return;
-	}
-
 	/* Free device number */
 	ov511_devused &= ~(1 << ov->nr);