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media: tw686x: Fix oops on buffer alloc failure 

[ Upstream commit 5a1a2f63d8 ]

The error path currently calls tw686x_video_free() which requires
vc->dev to be initialized, causing a NULL dereference on uninitizalized
channels.

Fix this by setting the vc->dev fields for all the channels first.

Fixes: f8afaa8dbc ("[media] tw686x: Introduce an interface to support multiple DMA modes")

Signed-off-by: Krzysztof Ha?asa <khalasa@piap.pl>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Krzysztof Ha?asa 2018-06-28 17:45:07 -04:00 committed by Greg Kroah-Hartman
parent ee83ce188e
commit 58119f9bd9
1 changed files with 8 additions and 3 deletions
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11
drivers/media/pci/tw686x/tw686x-video.c
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@ -1190,6 +1190,14 @@ int tw686x_video_init(struct tw686x_dev *dev)
return err;
}
/* Initialize vc->dev and vc->ch for the error path */
for (ch = 0; ch < max_channels(dev); ch++) {
struct tw686x_video_channel *vc = &dev->video_channels[ch];
vc->dev = dev;
vc->ch = ch;
}
for (ch = 0; ch < max_channels(dev); ch++) {
struct tw686x_video_channel *vc = &dev->video_channels[ch];
struct video_device *vdev;
@ -1198,9 +1206,6 @@ int tw686x_video_init(struct tw686x_dev *dev)
spin_lock_init(&vc->qlock);
INIT_LIST_HEAD(&vc->vidq_queued);
vc->dev = dev;
vc->ch = ch;
/* default settings */
err = tw686x_set_standard(vc, V4L2_STD_NTSC);
if (err)