media: tw686x: Fix oops on buffer alloc failure
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: f8afaa8dbc0d ("[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>
diff --git a/drivers/media/pci/tw686x/tw686x-video.c b/drivers/media/pci/tw686x/tw686x-video.c
index 0ea8dd4..3a06c00 100644
--- a/drivers/media/pci/tw686x/tw686x-video.c
+++ b/drivers/media/pci/tw686x/tw686x-video.c
@@ -1190,6 +1190,14 @@
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 @@
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)