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15.20.9846.021; Fri, 24 Apr 2026 23:20:00 +0000 From: Xiaolei Wang To: laurent.pinchart@ideasonboard.com, mchehab@kernel.org, Frank.Li@nxp.com, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, aisheng.dong@nxp.com, jacopo@jmondi.org, guoniu.zhou@nxp.com, s.riedmueller@phytec.de, Xiaolei.Wang@windriver.com Cc: linux-media@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 1/3] media: imx8-isi: fix use-after-free on remove Date: Sat, 25 Apr 2026 07:19:24 +0800 Message-ID: <20260424231926.406079-2-xiaolei.wang@windriver.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260424231926.406079-1-xiaolei.wang@windriver.com> References: <20260424231926.406079-1-xiaolei.wang@windriver.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SI2PR02CA0032.apcprd02.prod.outlook.com (2603:1096:4:195::12) To DS4PPFD667CEBB6.namprd11.prod.outlook.com (2603:10b6:f:fc02::53) 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XQUHxahx2VwicNNnclHdmg+9nN8Papeq4un3hF6rnlKqZ7URx9xHZQrZXvM8gCT8ZwokX+rpPH7 /xYmuo3cAiqw6EpJcT1WL1vIqZY8EsW2LQJqKB08YdnJMaikGxhD44AOvfj5xIe89DBNVXxvN0T hZ+yaemt0rihLHUOIhw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-24_04,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 adultscore=0 clxscore=1015 phishscore=0 bulkscore=0 spamscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604240227 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Frank Li --- 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 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); } =20 - mxc_isi_crossbar_cleanup(&isi->crossbar); mxc_isi_v4l2_cleanup(isi); + mxc_isi_crossbar_cleanup(&isi->crossbar); } =20 static const struct of_device_id mxc_isi_of_match[] =3D { --=20 2.43.0 From nobody Fri Jun 19 09:27:05 2026 Received: from mx0b-0064b401.pphosted.com (mx0b-0064b401.pphosted.com [205.220.178.238]) (using TLSv1.2 with cipher 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15.20.9846.021; Fri, 24 Apr 2026 23:20:06 +0000 From: Xiaolei Wang To: laurent.pinchart@ideasonboard.com, mchehab@kernel.org, Frank.Li@nxp.com, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, aisheng.dong@nxp.com, jacopo@jmondi.org, guoniu.zhou@nxp.com, s.riedmueller@phytec.de, Xiaolei.Wang@windriver.com Cc: linux-media@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH 2/3] media: imx8-isi: add missing v4l2_subdev_cleanup() in crossbar and pipe Date: Sat, 25 Apr 2026 07:19:25 +0800 Message-ID: <20260424231926.406079-3-xiaolei.wang@windriver.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260424231926.406079-1-xiaolei.wang@windriver.com> References: <20260424231926.406079-1-xiaolei.wang@windriver.com> Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SI2PR02CA0032.apcprd02.prod.outlook.com (2603:1096:4:195::12) To DS4PPFD667CEBB6.namprd11.prod.outlook.com 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a=VwQbUJbxAAAA:8 a=t7CeM3EgAAAA:8 a=lgr16xn9cv1HVsKBfnsA:9 a=FdTzh2GWekK77mhwV6Dw:22 X-Proofpoint-ORIG-GUID: Ha8Ni8d_VI9B7kwSzQzO3Dz2GEo1TBXw X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-24_04,2026-04-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 phishscore=0 lowpriorityscore=0 impostorscore=0 spamscore=0 adultscore=0 clxscore=1011 bulkscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604240227 Content-Type: text/plain; charset="utf-8" Both mxc_isi_crossbar_init() and mxc_isi_pipe_init() call v4l2_subdev_init_finalize() which allocates the subdev active state, but neither mxc_isi_crossbar_cleanup() nor mxc_isi_pipe_cleanup() calls v4l2_subdev_cleanup() to free it. This causes a memory leak on every rmmod, reported by kmemleak: unreferenced object 0xffff0000d06fc800 (size 192): comm "(udev-worker)", pid 254, jiffies 4294913455 backtrace (crc 36eeae58): kmemleak_alloc+0x34/0x40 __kvmalloc_node_noprof+0x5f8/0x7d8 __v4l2_subdev_state_alloc+0x1fc/0x30c __v4l2_subdev_init_finalize+0x178/0x368 Add the missing v4l2_subdev_cleanup() calls before media_entity_cleanup() in both crossbar and pipe cleanup paths. Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver") Cc: stable@vger.kernel.org Signed-off-by: Xiaolei Wang Reviewed-by: Frank Li --- drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c | 1 + drivers/media/platform/nxp/imx8-isi/imx8-isi-pipe.c | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c b/driv= ers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c index 605a45124103..c580c831972e 100644 --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-crossbar.c @@ -491,6 +491,7 @@ int mxc_isi_crossbar_init(struct mxc_isi_dev *isi) =20 void mxc_isi_crossbar_cleanup(struct mxc_isi_crossbar *xbar) { + v4l2_subdev_cleanup(&xbar->sd); media_entity_cleanup(&xbar->sd.entity); kfree(xbar->pads); kfree(xbar->inputs); diff --git a/drivers/media/platform/nxp/imx8-isi/imx8-isi-pipe.c b/drivers/= media/platform/nxp/imx8-isi/imx8-isi-pipe.c index a41c51dd9ce0..cb50af2270f6 100644 --- 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clxscore=1015 bulkscore=0 priorityscore=1501 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2604240227 mxc_isi_probe() allocates isi->pipes with kzalloc_objs() but never frees it on any probe failure path or in mxc_isi_remove(), leaking the allocation on every failed probe and every normal unbind. Additionally, when mxc_isi_pipe_init() fails partway through the channel loop or when mxc_isi_v4l2_init() fails, the already initialized pipes are not cleaned up =E2=80=94 their media entities and mutexes are leaked. Fix the pipes memory leak by switching from kzalloc_objs() to devm_kcalloc(), which ties the allocation lifetime to the device and eliminates the need for explicit kfree() in all error paths and in mxc_isi_remove(). Fix the pipe init leak by cleaning up already-initialized pipes in the err_xbar error path. Fixes: cf21f328fcaf ("media: nxp: Add i.MX8 ISI driver") Cc: stable@vger.kernel.org Signed-off-by: Xiaolei Wang --- drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c | 5 ++++- 1 file changed, 4 insertions(+), 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 2d639b789910..8533a979d60a 100644 --- a/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c +++ b/drivers/media/platform/nxp/imx8-isi/imx8-isi-core.c @@ -485,7 +485,8 @@ static int mxc_isi_probe(struct platform_device *pdev) =20 isi->pdata =3D of_device_get_match_data(dev); =20 - isi->pipes =3D kzalloc_objs(isi->pipes[0], isi->pdata->num_channels); + isi->pipes =3D devm_kcalloc(dev, isi->pdata->num_channels, + sizeof(*isi->pipes), GFP_KERNEL); if (!isi->pipes) return -ENOMEM; =20 @@ -538,6 +539,8 @@ static int mxc_isi_probe(struct platform_device *pdev) return 0; =20 err_xbar: + while (i--) + mxc_isi_pipe_cleanup(&isi->pipes[i]); mxc_isi_crossbar_cleanup(&isi->crossbar); =20 return ret; --=20 2.43.0