[media] media, cx231xx: Fix double free on close

In cx231xx_v4l2_close() there are two calls to
cx231xx_release_resources(dev) followed by kfree(dev). That is a
problem since cx231xx_release_resources() already kfree()'s its
argument, so we end up doing a double free.

Easily resolved by just removing the redundant kfree() calls after the
calls to cx231xx_release_resources().

I also changed the 'dev = NULL' assignments (which are rather
pointless since 'dev' is about to go out of scope), to 'fh->dev = NULL'
since it looks to me that that is what was actually intended.
And I removed the 'dev = NULL' assignment at the end of
cx231xx_release_resources() since it is pointless.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/cx231xx/cx231xx-cards.c b/drivers/media/video/cx231xx/cx231xx-cards.c
index 875a7ce..8ed460d 100644 (file)
--- a/drivers/media/video/cx231xx/cx231xx-cards.c
+++ b/drivers/media/video/cx231xx/cx231xx-cards.c
@@ -861,7 +861,6 @@ void cx231xx_release_resources(struct cx231xx *dev)
        kfree(dev->sliced_cc_mode.alt_max_pkt_size);
        kfree(dev->ts1_mode.alt_max_pkt_size);
        kfree(dev);
-       dev = NULL;
 }
 
 /*

diff --git a/drivers/media/video/cx231xx/cx231xx-video.c b/drivers/media/video/cx231xx/cx231xx-video.c
index 829a41b..7f916f0 100644 (file)
--- a/drivers/media/video/cx231xx/cx231xx-video.c
+++ b/drivers/media/video/cx231xx/cx231xx-video.c
@@ -2319,8 +2319,7 @@ static int cx231xx_v4l2_close(struct file *filp)
                        if (dev->state & DEV_DISCONNECTED) {
                                if (atomic_read(&dev->devlist_count) > 0) {
                                        cx231xx_release_resources(dev);
-                                       kfree(dev);
-                                       dev = NULL;
+                                       fh->dev = NULL;
                                        return 0;
                                }
                                return 0;
@@ -2350,8 +2349,7 @@ static int cx231xx_v4l2_close(struct file *filp)
                   free the remaining resources */
                if (dev->state & DEV_DISCONNECTED) {
                        cx231xx_release_resources(dev);
-                       kfree(dev);
-                       dev = NULL;
+                       fh->dev = NULL;
                        return 0;
                }