linux-kernel - [PATCH] media: saa7146: Avoid using BUG

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Message-Id: <20191215192133.3765-1-pakki001@umn.edu>
Date:   Sun, 15 Dec 2019 13:21:33 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] media: saa7146: Avoid using BUG_ON as an assertion

In video_begin and video_end, saa7146_format_by_fourcc can return
NULL and is checked via BUG_ON. However, by returning the error
to the callers upstream, we can avoid the crash and handle it via
recovery code.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/media/common/saa7146/saa7146_video.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/media/common/saa7146/saa7146_video.c b/drivers/media/common/saa7146/saa7146_video.c
index d16122039b0c..1b6b5d43ad3e 100644
--- a/drivers/media/common/saa7146/saa7146_video.c
+++ b/drivers/media/common/saa7146/saa7146_video.c
@@ -345,7 +345,8 @@ static int video_begin(struct saa7146_fh *fh)
 
 	fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
 	/* we need to have a valid format set here */
-	BUG_ON(NULL == fmt);
+	if (NULL == fmt)
+		return -EINVAL;
 
 	if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
 		resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
@@ -398,7 +399,8 @@ static int video_end(struct saa7146_fh *fh, struct file *file)
 
 	fmt = saa7146_format_by_fourcc(dev, vv->video_fmt.pixelformat);
 	/* we need to have a valid format set here */
-	BUG_ON(NULL == fmt);
+	if (NULL == fmt)
+		return -EINVAL;
 
 	if (0 != (fmt->flags & FORMAT_IS_PLANAR)) {
 		resource = RESOURCE_DMA1_HPS|RESOURCE_DMA2_CLP|RESOURCE_DMA3_BRS;
-- 
2.20.1