FAILED: patch "[PATCH] media: zoran: Avoid freeing a registered video_device twice" failed to apply to 5.10-stable tree

The patch below does not apply to the 5.10-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 <[email protected]>.

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-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 0735e0b5a96761a9ce277a238e834008ad92a0a5
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026090920-computing-favored-d2a1@gregkh' --subject-prefix 'PATCH 5.10.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 <[email protected]>
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.

index 8bcf355a5418..e5ff407318df 100644
@@ -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)

From: Ruoyu Wang <[email protected]>

[ Upstream commit 0735e0b5a96761a9ce277a238e834008ad92a0a5 ]

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.

---
 drivers/staging/media/zoran/zoran_card.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index fe0cca12119c7..9ee30b70b9d9b 100644
@@ -831,7 +831,7 @@ 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)

2.53.0