linux-kernel - [PATCH 3.19.y-ckt 122/164] vivid: Fix iteration in driver removal path

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Date:	Wed,  2 Dec 2015 08:59:33 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 122/164] vivid: Fix iteration in driver removal path

3.19.8-ckt11 -stable review patch.  If anyone has any objections, please let me know.

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

From: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>

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@...guardiasur.com.ar>
Signed-off-by: Mauro Carvalho Chehab <mchehab@....samsung.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/media/platform/vivid/vivid-core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/vivid/vivid-core.c b/drivers/media/platform/vivid/vivid-core.c
index a7e033a..d801b57 100644
--- a/drivers/media/platform/vivid/vivid-core.c
+++ b/drivers/media/platform/vivid/vivid-core.c
@@ -1314,8 +1314,11 @@ static void __exit vivid_exit(void)
 	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",
-- 
1.9.1

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