[PATCH v2] media: allegro: add the missed check for v4l2_m2m_ctx_init

[Chuhong Yuan <hslester96@xxxxxxxxx>]

allegro_open() misses a check for v4l2_m2m_ctx_init().
Add a check and error handling code to fix it.

Fixes: f20387dfd065 ("media: allegro: add Allegro DVT video IP core driver")
Signed-off-by: Chuhong Yuan <hslester96@xxxxxxxxx>
---
Changes in v2:
  - Fix the use-after-free in v1.

 drivers/staging/media/allegro-dvt/allegro-core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-dvt/allegro-core.c
index 6f0cd0784786..66736beb67af 100644
--- a/drivers/staging/media/allegro-dvt/allegro-core.c
+++ b/drivers/staging/media/allegro-dvt/allegro-core.c
@@ -2270,6 +2270,7 @@ static int allegro_open(struct file *file)
 	struct allegro_channel *channel = NULL;
 	struct v4l2_ctrl_handler *handler;
 	u64 mask;
+	int ret;
 
 	channel = kzalloc(sizeof(*channel), GFP_KERNEL);
 	if (!channel)
@@ -2341,6 +2342,14 @@ static int allegro_open(struct file *file)
 	channel->fh.m2m_ctx = v4l2_m2m_ctx_init(dev->m2m_dev, channel,
 						allegro_queue_init);
 
+	if (IS_ERR(channel->fh.m2m_ctx)) {
+		ret = PTR_ERR(channel->fh.m2m_ctx);
+		v4l2_fh_del(&channel->fh);
+		v4l2_fh_exit(&channel->fh);
+		kfree(channel);
+		return ret;
+	}
+
 	return 0;
 }
 
-- 
2.24.0