linux-kernel - [PATCH v2 2/2] media: staging/intel-ipu3: Fix set

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Date:   Mon, 15 Mar 2021 13:34:06 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tianshu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, linux-media@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda <ribalda@...omium.org>, stable@...r.kernel.org
Subject: [PATCH v2 2/2] media: staging/intel-ipu3: Fix set_fmt error handling

If there in an error during a set_fmt, do not overwrite the previous
sizes with the invalid config.

[   38.662975] ipu3-imgu 0000:00:05.0: swiotlb buffer is full (sz: 4096 bytes)
[   38.662980] DMA: Out of SW-IOMMU space for 4096 bytes at device 0000:00:05.0
[   38.663010] general protection fault: 0000 [#1] PREEMPT SMP

Cc: stable@...r.kernel.org
Fixes: 6d5f26f2e045 ("media: staging/intel-ipu3-v4l: reduce kernel stack usage")
Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/staging/media/ipu3/ipu3-v4l2.c | 25 ++++++++++++++-----------
 1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/staging/media/ipu3/ipu3-v4l2.c b/drivers/staging/media/ipu3/ipu3-v4l2.c
index 35a74d99322f..6d9c49b39531 100644
--- a/drivers/staging/media/ipu3/ipu3-v4l2.c
+++ b/drivers/staging/media/ipu3/ipu3-v4l2.c
@@ -686,6 +686,7 @@ static int imgu_fmt(struct imgu_device *imgu, unsigned int pipe, int node,
 
 	dev_dbg(dev, "IPU3 pipe %u pipe_id = %u", pipe, css_pipe->pipe_id);
 
+	css_q = imgu_node_to_queue(node);
 	for (i = 0; i < IPU3_CSS_QUEUES; i++) {
 		unsigned int inode = imgu_map_node(imgu, i);
 
@@ -700,6 +701,11 @@ static int imgu_fmt(struct imgu_device *imgu, unsigned int pipe, int node,
 			continue;
 		}
 
+		if (i == css_q) {
+			fmts[i] = &f->fmt.pix_mp;
+			continue;
+		}
+
 		if (try) {
 			fmts[i] = kmemdup(&imgu_pipe->nodes[inode].vdev_fmt.fmt.pix_mp,
 					  sizeof(struct v4l2_pix_format_mplane),
@@ -728,16 +734,10 @@ static int imgu_fmt(struct imgu_device *imgu, unsigned int pipe, int node,
 		rects[IPU3_CSS_RECT_GDC]->height = pad_fmt.height;
 	}
 
-	/*
-	 * imgu doesn't set the node to the value given by user
-	 * before we return success from this function, so set it here.
-	 */
-	css_q = imgu_node_to_queue(node);
 	if (!fmts[css_q]) {
 		ret = -EINVAL;
 		goto out;
 	}
-	*fmts[css_q] = f->fmt.pix_mp;
 
 	if (try)
 		ret = imgu_css_fmt_try(&imgu->css, fmts, rects, pipe);
@@ -748,15 +748,18 @@ static int imgu_fmt(struct imgu_device *imgu, unsigned int pipe, int node,
 	if (ret < 0)
 		goto out;
 
-	if (try)
-		f->fmt.pix_mp = *fmts[css_q];
-	else
-		f->fmt = imgu_pipe->nodes[node].vdev_fmt.fmt;
+	/*
+	 * imgu doesn't set the node to the value given by user
+	 * before we return success from this function, so set it here.
+	 */
+	if (!try)
+		imgu_pipe->nodes[node].vdev_fmt.fmt.pix_mp = f->fmt.pix_mp;
 
 out:
 	if (try) {
 		for (i = 0; i < IPU3_CSS_QUEUES; i++)
-			kfree(fmts[i]);
+			if (i != css_q)
+				kfree(fmts[i]);
 	}
 
 	return ret;
-- 
2.31.0.rc2.261.g7f71774620-goog