* FAILED: patch "[PATCH] media: nxp: imx8-isi: Fix use-after-free on remove" failed to apply to 6.12-stable tree
@ 2026-07-13 13:41 gregkh
2026-07-15 16:32 ` [PATCH 6.12.y 1/2] media: nxp: imx8-isi: use devm_pm_runtime_enable() to simplify code Sasha Levin
0 siblings, 1 reply; 3+ messages in thread
From: gregkh @ 2026-07-13 13:41 UTC (permalink / raw)
To: xiaolei.wang, Frank.Li, hverkuil+cisco, laurent.pinchart; +Cc: stable
The patch below does not apply to the 6.12-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-6.12.y
git checkout FETCH_HEAD
git cherry-pick -x b670bf89824ede5d07d20bb9bfbafb754846081d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026071342-backfire-varsity-a0ef@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..'
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From b670bf89824ede5d07d20bb9bfbafb754846081d Mon Sep 17 00:00:00 2001
From: Xiaolei Wang <xiaolei.wang@windriver.com>
Date: Thu, 7 May 2026 12:13:15 +0800
Subject: [PATCH] media: nxp: imx8-isi: Fix use-after-free on remove
KASAN reports a slab-use-after-free in __media_entity_remove_link()
during rmmod of imx8_isi:
BUG: KASAN: slab-use-after-free in __media_entity_remove_link+0x608/0x650
Read of size 2 at addr ffff0000d47cb02a by task rmmod/724
Call trace:
__media_entity_remove_link+0x608/0x650
__media_entity_remove_links+0x78/0x144
__media_device_unregister_entity+0x150/0x280
media_device_unregister_entity+0x48/0x68
v4l2_device_unregister_subdev+0x158/0x300
v4l2_async_unbind_subdev_one+0x22c/0x358
v4l2_async_nf_unbind_all_subdevs+0xfc/0x1c0
v4l2_async_nf_unregister+0x5c/0x14c
mxc_isi_remove+0x124/0x2a0 [imx8_isi]
Allocated by task 249:
__kmalloc_noprof+0x27c/0x690
mxc_isi_crossbar_init+0x22c/0x560 [imx8_isi]
Freed by task 724:
kfree+0x1e4/0x5b0
mxc_isi_crossbar_cleanup+0x34/0x80 [imx8_isi]
mxc_isi_remove+0x11c/0x2a0 [imx8_isi]
The problem is that mxc_isi_remove() calls mxc_isi_crossbar_cleanup()
before mxc_isi_v4l2_cleanup(). The crossbar cleanup frees the media
entity pads, but the subsequent v4l2 cleanup still tries to remove
media links that reference those pads.
Fix this by calling mxc_isi_v4l2_cleanup() before
mxc_isi_crossbar_cleanup() to ensure all media entities are properly
unregistered while the pads are still valid.
Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver")
Cc: stable@vger.kernel.org
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20260507041318.491594-2-xiaolei.wang@windriver.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
index 4bf8570e1b9e..2d639b789910 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
@@ -556,8 +556,8 @@ static void mxc_isi_remove(struct platform_device *pdev)
mxc_isi_pipe_cleanup(pipe);
}
- mxc_isi_crossbar_cleanup(&isi->crossbar);
mxc_isi_v4l2_cleanup(isi);
+ mxc_isi_crossbar_cleanup(&isi->crossbar);
}
static const struct of_device_id mxc_isi_of_match[] = {
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH 6.12.y 1/2] media: nxp: imx8-isi: use devm_pm_runtime_enable() to simplify code
2026-07-13 13:41 FAILED: patch "[PATCH] media: nxp: imx8-isi: Fix use-after-free on remove" failed to apply to 6.12-stable tree gregkh
@ 2026-07-15 16:32 ` Sasha Levin
2026-07-15 16:32 ` [PATCH 6.12.y 2/2] media: nxp: imx8-isi: Fix use-after-free on remove Sasha Levin
0 siblings, 1 reply; 3+ messages in thread
From: Sasha Levin @ 2026-07-15 16:32 UTC (permalink / raw)
To: stable; +Cc: Frank Li, Laurent Pinchart, Hans Verkuil, Sasha Levin
From: Frank Li <Frank.Li@nxp.com>
[ Upstream commit 078161dd44d6f848a62a473206d69025607736ec ]
Use devm_pm_runtime_enable() to simplify code. Change to use
dev_err_probe() because previous goto change to return.
No functional change.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20260116-cam_cleanup-v4-2-29ce01640443@nxp.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Stable-dep-of: b670bf89824e ("media: nxp: imx8-isi: Fix use-after-free on remove")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
.../media/platform/nxp/imx8-isi/imx8-isi-core.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
index c2013995049c60..560d58ff2db8bd 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
@@ -472,13 +472,14 @@ static int mxc_isi_probe(struct platform_device *pdev)
return ret;
}
- pm_runtime_enable(dev);
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
ret = mxc_isi_crossbar_init(isi);
- if (ret) {
- dev_err(dev, "Failed to initialize crossbar: %d\n", ret);
- goto err_pm;
- }
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to initialize crossbar\n");
for (i = 0; i < isi->pdata->num_channels; ++i) {
ret = mxc_isi_pipe_init(isi, i);
@@ -501,8 +502,7 @@ static int mxc_isi_probe(struct platform_device *pdev)
err_xbar:
mxc_isi_crossbar_cleanup(&isi->crossbar);
-err_pm:
- pm_runtime_disable(isi->dev);
+
return ret;
}
@@ -521,8 +521,6 @@ static void mxc_isi_remove(struct platform_device *pdev)
mxc_isi_crossbar_cleanup(&isi->crossbar);
mxc_isi_v4l2_cleanup(isi);
-
- pm_runtime_disable(isi->dev);
}
static const struct of_device_id mxc_isi_of_match[] = {
--
2.53.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH 6.12.y 2/2] media: nxp: imx8-isi: Fix use-after-free on remove
2026-07-15 16:32 ` [PATCH 6.12.y 1/2] media: nxp: imx8-isi: use devm_pm_runtime_enable() to simplify code Sasha Levin
@ 2026-07-15 16:32 ` Sasha Levin
0 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2026-07-15 16:32 UTC (permalink / raw)
To: stable; +Cc: Xiaolei Wang, Frank Li, Laurent Pinchart, Hans Verkuil,
Sasha Levin
From: Xiaolei Wang <xiaolei.wang@windriver.com>
[ Upstream commit b670bf89824ede5d07d20bb9bfbafb754846081d ]
KASAN reports a slab-use-after-free in __media_entity_remove_link()
during rmmod of imx8_isi:
BUG: KASAN: slab-use-after-free in __media_entity_remove_link+0x608/0x650
Read of size 2 at addr ffff0000d47cb02a by task rmmod/724
Call trace:
__media_entity_remove_link+0x608/0x650
__media_entity_remove_links+0x78/0x144
__media_device_unregister_entity+0x150/0x280
media_device_unregister_entity+0x48/0x68
v4l2_device_unregister_subdev+0x158/0x300
v4l2_async_unbind_subdev_one+0x22c/0x358
v4l2_async_nf_unbind_all_subdevs+0xfc/0x1c0
v4l2_async_nf_unregister+0x5c/0x14c
mxc_isi_remove+0x124/0x2a0 [imx8_isi]
Allocated by task 249:
__kmalloc_noprof+0x27c/0x690
mxc_isi_crossbar_init+0x22c/0x560 [imx8_isi]
Freed by task 724:
kfree+0x1e4/0x5b0
mxc_isi_crossbar_cleanup+0x34/0x80 [imx8_isi]
mxc_isi_remove+0x11c/0x2a0 [imx8_isi]
The problem is that mxc_isi_remove() calls mxc_isi_crossbar_cleanup()
before mxc_isi_v4l2_cleanup(). The crossbar cleanup frees the media
entity pads, but the subsequent v4l2 cleanup still tries to remove
media links that reference those pads.
Fix this by calling mxc_isi_v4l2_cleanup() before
mxc_isi_crossbar_cleanup() to ensure all media entities are properly
unregistered while the pads are still valid.
Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver")
Cc: stable@vger.kernel.org
Signed-off-by: Xiaolei Wang <xiaolei.wang@windriver.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patch.msgid.link/20260507041318.491594-2-xiaolei.wang@windriver.com
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
index 560d58ff2db8bd..a161dc32689542 100644
--- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
+++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c
@@ -519,8 +519,8 @@ static void mxc_isi_remove(struct platform_device *pdev)
mxc_isi_pipe_cleanup(pipe);
}
- mxc_isi_crossbar_cleanup(&isi->crossbar);
mxc_isi_v4l2_cleanup(isi);
+ mxc_isi_crossbar_cleanup(&isi->crossbar);
}
static const struct of_device_id mxc_isi_of_match[] = {
--
2.53.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
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2026-07-13 13:41 FAILED: patch "[PATCH] media: nxp: imx8-isi: Fix use-after-free on remove" failed to apply to 6.12-stable tree gregkh
2026-07-15 16:32 ` [PATCH 6.12.y 1/2] media: nxp: imx8-isi: use devm_pm_runtime_enable() to simplify code Sasha Levin
2026-07-15 16:32 ` [PATCH 6.12.y 2/2] media: nxp: imx8-isi: Fix use-after-free on remove Sasha Levin
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