FAILED: patch "[PATCH] media: zoran: Avoid freeing a registered video_device twice" failed to apply to 5.15-stable tree

[<gregkh@linuxfoundation.org>]

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@vger.kernel.org>.

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 0735e0b5a96761a9ce277a238e834008ad92a0a5
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090919-ricotta-twitter-442e@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From 0735e0b5a96761a9ce277a238e834008ad92a0a5 Mon Sep 17 00:00:00 2001
From: Ruoyu Wang <ruoyuw560@gmail.com>
Date: Wed, 8 Jul 2026 22:33:49 +0800
Subject: [PATCH] media: zoran: Avoid freeing a registered video_device twice

zoran_init_video_device() installs zoran_vdev_release() as the
video_device release callback through zoran_template. After
video_register_device() succeeds, video_unregister_device() drops the
registered video_device reference and the V4L2 core eventually invokes
that release callback, which kfree()s the video_device.

zoran_exit_video_devices() called video_unregister_device() and then
kfree(zr->video_dev), so device teardown could free the same
video_device twice.

Remove the direct kfree() and clear the cached pointer after
unregistering. The pre-registration failure path keeps its manual free
because the video_device was not registered there.

This issue was found by a static analysis checker and confirmed by
manual source review.

Fixes: 82e3a496eb56 ("media: staging: media: zoran: move videodev alloc")
Cc: stable@vger.kernel.org
Signed-off-by: Ruoyu Wang <ruoyuw560@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

diff --git a/drivers/media/pci/zoran/zoran_card.c b/drivers/media/pci/zoran/zoran_card.c
index 8bcf355a5418..e5ff407318df 100644
--- a/drivers/media/pci/zoran/zoran_card.c
+++ b/drivers/media/pci/zoran/zoran_card.c
@@ -886,7 +886,7 @@ static int zoran_init_video_device(struct zoran *zr, struct video_device *video_
 static void zoran_exit_video_devices(struct zoran *zr)
 {
 	video_unregister_device(zr->video_dev);
-	kfree(zr->video_dev);
+	zr->video_dev = NULL;
 }
 
 static int zoran_init_video_devices(struct zoran *zr)