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

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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>
This commit is contained in:
Jesper Juhl 2012-03-04 16:25:04 -03:00 committed by Mauro Carvalho Chehab
parent 1a611d8cd0
commit 266e8ae37d
2 changed files with 2 additions and 5 deletions
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1
drivers/media/video/cx231xx/cx231xx-cards.c
View file

@ -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;
}
/*

6
drivers/media/video/cx231xx/cx231xx-video.c
View file

@ -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;
}