linux-kernel - [PATCH v1 1/1] media: atomisp: fix "variable dereferenced before check 'asd'"

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Date:   Wed,  1 Dec 2021 23:19:04 +0900
From:   Tsuchiya Yuto <kitakar@...il.com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Tsuchiya Yuto <kitakar@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH v1 1/1] media: atomisp: fix "variable dereferenced before check 'asd'"

There are two occurrences where the variable 'asd' is dereferenced
before check. Fix this issue by using the variable after the check.

Link: https://lore.kernel.org/linux-media/20211122074122.GA6581@kili/
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Tsuchiya Yuto <kitakar@...il.com>

---

I didn't add the Fixes tag considering that the media_stage tree can
be rebased. Here is the commit of the media_stage tree pointed out in
the Link,

	c10bcb13462e ("media: atomisp: add NULL check for asd obtained from atomisp_video_pipe")

Can be applied on the top of media_stage tree.
---
 drivers/staging/media/atomisp/pci/atomisp_cmd.c   | 3 ++-
 drivers/staging/media/atomisp/pci/atomisp_ioctl.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_cmd.c b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
index 5a90cc31cd1a..97d5a528969b 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_cmd.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
@@ -5185,7 +5185,7 @@ static int atomisp_set_fmt_to_isp(struct video_device *vdev,
 	int (*configure_pp_input)(struct atomisp_sub_device *asd,
 				  unsigned int width, unsigned int height) =
 				      configure_pp_input_nop;
-	u16 stream_index = atomisp_source_pad_to_stream_id(asd, source_pad);
+	u16 stream_index;
 	const struct atomisp_in_fmt_conv *fc;
 	int ret, i;
 
@@ -5194,6 +5194,7 @@ static int atomisp_set_fmt_to_isp(struct video_device *vdev,
 			__func__, vdev->name);
 		return -EINVAL;
 	}
+	stream_index = atomisp_source_pad_to_stream_id(asd, source_pad);
 
 	v4l2_fh_init(&fh.vfh, vdev);
 
diff --git a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
index 562789c75299..8fd470efd658 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_ioctl.c
@@ -1182,7 +1182,7 @@ int __atomisp_reqbufs(struct file *file, void *fh,
 	struct ia_css_frame *frame;
 	struct videobuf_vmalloc_memory *vm_mem;
 	u16 source_pad = atomisp_subdev_source_pad(vdev);
-	u16 stream_id = atomisp_source_pad_to_stream_id(asd, source_pad);
+	u16 stream_id;
 	int ret = 0, i = 0;
 
 	if (!asd) {
@@ -1190,6 +1190,7 @@ int __atomisp_reqbufs(struct file *file, void *fh,
 			__func__, vdev->name);
 		return -EINVAL;
 	}
+	stream_id = atomisp_source_pad_to_stream_id(asd, source_pad);
 
 	if (req->count == 0) {
 		mutex_lock(&pipe->capq.vb_lock);
-- 
2.34.1