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Commit 7ca4ba25 authored by Pan Bian's avatar Pan Bian Committed by Greg Kroah-Hartman
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cx25840: fix unchecked return values 




[ Upstream commit 35378ce143071c2a6bad4b59a000e9b9f8f6ea67 ]

In functions cx25840_initialize(), cx231xx_initialize(), and
cx23885_initialize(), the return value of create_singlethread_workqueue()
is used without validation. This may result in NULL dereference and cause
kernel crash. This patch fixes it.

Signed-off-by: default avatarPan Bian <bianpan2016@163.com>
Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: default avatarSasha Levin <alexander.levin@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7860df19

drivers/media/i2c/cx25840/cx25840-core.c

+21 −15
Original line number Diff line number Diff line
@@ -420,11 +420,13 @@ static void cx25840_initialize(struct i2c_client *client) 
	INIT_WORK(&state->fw_work, cx25840_work_handler);

	init_waitqueue_head(&state->fw_wait);

	q = create_singlethread_workqueue("cx25840_fw");

	if (q) {

		prepare_to_wait(&state->fw_wait, &wait, TASK_UNINTERRUPTIBLE);

		queue_work(q, &state->fw_work);

		schedule();

		finish_wait(&state->fw_wait, &wait);

		destroy_workqueue(q);

	}



	/* 6. */

	cx25840_write(client, 0x115, 0x8c);
@@ -631,11 +633,13 @@ static void cx23885_initialize(struct i2c_client *client) 
	INIT_WORK(&state->fw_work, cx25840_work_handler);

	init_waitqueue_head(&state->fw_wait);

	q = create_singlethread_workqueue("cx25840_fw");

	if (q) {

		prepare_to_wait(&state->fw_wait, &wait, TASK_UNINTERRUPTIBLE);

		queue_work(q, &state->fw_work);

		schedule();

		finish_wait(&state->fw_wait, &wait);

		destroy_workqueue(q);

	}



	/* Call the cx23888 specific std setup func, we no longer rely on

	 * the generic cx24840 func.
@@ -746,11 +750,13 @@ static void cx231xx_initialize(struct i2c_client *client) 
	INIT_WORK(&state->fw_work, cx25840_work_handler);

	init_waitqueue_head(&state->fw_wait);

	q = create_singlethread_workqueue("cx25840_fw");

	if (q) {

		prepare_to_wait(&state->fw_wait, &wait, TASK_UNINTERRUPTIBLE);

		queue_work(q, &state->fw_work);

		schedule();

		finish_wait(&state->fw_wait, &wait);

		destroy_workqueue(q);

	}



	cx25840_std_setup(client);