linux-kernel - [PATCH] media: allegro: add the missed check for v4l2_m2m_ctx

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Date:   Mon,  9 Dec 2019 16:58:07 +0800
From:   Chuhong Yuan <hslester96@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Michael Tretter <m.tretter@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, Chuhong Yuan <hslester96@...il.com>
Subject: [PATCH] media: allegro: add the missed check for v4l2_m2m_ctx_init

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@...il.com>
---
 drivers/staging/media/allegro-dvt/allegro-core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/staging/media/allegro-dvt/allegro-core.c b/drivers/staging/media/allegro-dvt/allegro-core.c
index 6f0cd0784786..5f1d454b41bb 100644
--- a/drivers/staging/media/allegro-dvt/allegro-core.c
+++ b/drivers/staging/media/allegro-dvt/allegro-core.c
@@ -2341,6 +2341,13 @@ 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)) {
+		v4l2_fh_del(&channel->fh);
+		v4l2_fh_exit(&channel->fh);
+		kfree(channel);
+		return PTR_ERR(channel->fh.m2m_ctx);
+	}
+
 	return 0;
 }
 
-- 
2.24.0