[PATCH 4.3 086/200] [media] vivid: Fix iteration in driver removal path

From: Greg Kroah-Hartman
Date: Sun Feb 14 2016 - 17:39:52 EST


4.3-stable review patch. If anyone has any objections, please let me know.

------------------

From: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>

commit a5d42b8c3b3ddccd88dc1c70957177d31a6699fb upstream.

When the diver is removed and all the resources are deallocated,
we should be iterating through the created devices only.

Currently, the iteration ends when vivid_devs[i] is NULL. Since
the array contains VIVID_MAX_DEVS elements, it will oops if
n_devs=VIVID_MAX_DEVS because in that case, no element is NULL.

Fixes: c88a96b023d8 ('[media] vivid: add core driver code')

Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/media/platform/vivid/vivid-core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/media/platform/vivid/vivid-core.c
+++ b/drivers/media/platform/vivid/vivid-core.c
@@ -1341,8 +1341,11 @@ static int vivid_remove(struct platform_
struct vivid_dev *dev;
unsigned i;

- for (i = 0; vivid_devs[i]; i++) {
+
+ for (i = 0; i < n_devs; i++) {
dev = vivid_devs[i];
+ if (!dev)
+ continue;

if (dev->has_vid_cap) {
v4l2_info(&dev->v4l2_dev, "unregistering %s\n",