FAILED: patch "[PATCH] media: mtk-jpeg: Fix use after free bug due to error path" failed to apply to 5.15-stable tree

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The patch below does not apply to the 5.15-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y
git checkout FETCH_HEAD
git cherry-pick -x 206c857dd17d4d026de85866f1b5f0969f2a109e
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2024012653-marital-palpitate-7d96@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

206c857dd17d ("media: mtk-jpeg: Fix use after free bug due to error path handling in mtk_jpeg_dec_device_run")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 206c857dd17d4d026de85866f1b5f0969f2a109e Mon Sep 17 00:00:00 2001
From: Zheng Wang <zyytlz.wz@xxxxxxx>
Date: Mon, 6 Nov 2023 15:48:10 +0100
Subject: [PATCH] media: mtk-jpeg: Fix use after free bug due to error path
 handling in mtk_jpeg_dec_device_run

In mtk_jpeg_probe, &jpeg->job_timeout_work is bound with
mtk_jpeg_job_timeout_work.

In mtk_jpeg_dec_device_run, if error happens in
mtk_jpeg_set_dec_dst, it will finally start the worker while
mark the job as finished by invoking v4l2_m2m_job_finish.

There are two methods to trigger the bug. If we remove the
module, it which will call mtk_jpeg_remove to make cleanup.
The possible sequence is as follows, which will cause a
use-after-free bug.

CPU0                  CPU1
mtk_jpeg_dec_...    |
  start worker	    |
                    |mtk_jpeg_job_timeout_work
mtk_jpeg_remove     |
  v4l2_m2m_release  |
    kfree(m2m_dev); |
                    |
                    | v4l2_m2m_get_curr_priv
                    |   m2m_dev->curr_ctx //use

If we close the file descriptor, which will call mtk_jpeg_release,
it will have a similar sequence.

Fix this bug by starting timeout worker only if started jpegdec worker
successfully. Then v4l2_m2m_job_finish will only be called in
either mtk_jpeg_job_timeout_work or mtk_jpeg_dec_device_run.

Fixes: b2f0d2724ba4 ("[media] vcodec: mediatek: Add Mediatek JPEG Decoder Driver")
Signed-off-by: Zheng Wang <zyytlz.wz@xxxxxxx>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@xxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>

diff --git a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
index 7c2e6a2f6c40..63165f05e123 100644
--- a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
@@ -1020,13 +1020,13 @@ static void mtk_jpeg_dec_device_run(void *priv)
 	if (ret < 0)
 		goto dec_end;
 
-	schedule_delayed_work(&jpeg->job_timeout_work,
-			      msecs_to_jiffies(MTK_JPEG_HW_TIMEOUT_MSEC));
-
 	mtk_jpeg_set_dec_src(ctx, &src_buf->vb2_buf, &bs);
 	if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param, &dst_buf->vb2_buf, &fb))
 		goto dec_end;
 
+	schedule_delayed_work(&jpeg->job_timeout_work,
+			      msecs_to_jiffies(MTK_JPEG_HW_TIMEOUT_MSEC));
+
 	spin_lock_irqsave(&jpeg->hw_lock, flags);
 	mtk_jpeg_dec_reset(jpeg->reg_base);
 	mtk_jpeg_dec_set_config(jpeg->reg_base,





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