Patch "[media] v4l: vsp1: Fix crash when resetting pipeline" has been added to the 4.7-stable tree

Patch "[media] v4l: vsp1: Fix crash when resetting pipeline" has been added to the 4.7-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    [media] v4l: vsp1: Fix crash when resetting pipeline

to the 4.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     v4l-vsp1-fix-crash-when-resetting-pipeline.patch
and it can be found in the queue-4.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d69e40fade97b6b19837c1772efa516bc28cc870 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Wed, 18 May 2016 20:01:21 -0300
Subject: [media] v4l: vsp1: Fix crash when resetting pipeline

From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

commit d69e40fade97b6b19837c1772efa516bc28cc870 upstream.

The vsp1_pipeline_reset() function loops over pipeline inputs and output
and resets them. When doing so it assumes both that the pipeline has
been correctly configured with an output, and that inputs are are stored
in the pipe inputs array at positions 0 to num_inputs-1.

Both the assumptions are incorrect. The pipeline might need to be reset
after a failed attempts to configure it, without any output specified.
Furthermore, inputs are stored in a positiong equal to their RPF index,
possibly creating holes in the inputs array if the RPFs are not used in
sequence.

Fix both issues by looping over the whole inputs array and skipping
unused entries, and ignoring the output when not set.

Fixes: ff7e97c94d9f ("[media] v4l: vsp1: Store pipeline pointer in rwpf")

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/platform/vsp1/vsp1_pipe.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/media/platform/vsp1/vsp1_pipe.c
+++ b/drivers/media/platform/vsp1/vsp1_pipe.c
@@ -172,13 +172,17 @@ void vsp1_pipeline_reset(struct vsp1_pip
 			bru->inputs[i].rpf = NULL;
 	}
 
-	for (i = 0; i < pipe->num_inputs; ++i) {
-		pipe->inputs[i]->pipe = NULL;
-		pipe->inputs[i] = NULL;
+	for (i = 0; i < ARRAY_SIZE(pipe->inputs); ++i) {
+		if (pipe->inputs[i]) {
+			pipe->inputs[i]->pipe = NULL;
+			pipe->inputs[i] = NULL;
+		}
 	}
 
-	pipe->output->pipe = NULL;
-	pipe->output = NULL;
+	if (pipe->output) {
+		pipe->output->pipe = NULL;
+		pipe->output = NULL;
+	}
 
 	INIT_LIST_HEAD(&pipe->entities);
 	pipe->state = VSP1_PIPELINE_STOPPED;


Patches currently in stable-queue which might be from laurent.pinchart+renesas@ideasonboard.com are

queue-4.7/v4l-vsp1-fix-crash-when-resetting-pipeline.patch