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Wed, 03 Jun 2026 12:51:47 -0700 (PDT) Received: from i4-gl-tmk5904.ad.psu.edu ([130.203.156.186]) by smtp.gmail.com with ESMTPSA id af79cd13be357-9158a2359ecsm337901685a.14.2026.06.03.12.51.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 03 Jun 2026 12:51:46 -0700 (PDT) From: Yuho Choi To: Manivannan Sadhasivam Cc: Kees Cook , Akhil Vinod , Sumit Kumar , Krishna Chaitanya Chundru , =?UTF-8?q?Adrian=20Barna=C5=9B?= , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Yuho Choi Subject: [PATCH v1] bus: mhi: ep: Fix device refcount leak on create failure Date: Wed, 3 Jun 2026 15:51:42 -0400 Message-ID: <20260603195142.2189386-1-dbgh9129@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" mhi_ep_create_device() takes one device reference for the UL channel and another for the DL channel after allocating the transfer device. These references are normally released by mhi_ep_destroy_device() before the device itself is removed. If dev_set_name() or device_add() fails, the error path currently drops only one reference. The remaining channel references keep the device from being released and leave the channels associated with a device that was never registered. Route both failures through a common unwind path that drops the DL channel reference, the UL channel reference, and the initial reference from device_initialize(). Fixes: 297c77a0f273 ("bus: mhi: ep: Add support for creating and destroying= MHI EP devices") Signed-off-by: Yuho Choi --- drivers/bus/mhi/ep/main.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/bus/mhi/ep/main.c b/drivers/bus/mhi/ep/main.c index 0277e1ab1198..34d3662eb091 100644 --- a/drivers/bus/mhi/ep/main.c +++ b/drivers/bus/mhi/ep/main.c @@ -1338,15 +1338,19 @@ static int mhi_ep_create_device(struct mhi_ep_cntrl= *mhi_cntrl, u32 ch_id) ret =3D dev_set_name(&mhi_dev->dev, "%s_%s", dev_name(&mhi_cntrl->mhi_dev->dev), mhi_dev->name); - if (ret) { - put_device(&mhi_dev->dev); - return ret; - } + if (ret) + goto err_put_channels; =20 ret =3D device_add(&mhi_dev->dev); if (ret) - put_device(&mhi_dev->dev); + goto err_put_channels; + + return 0; =20 +err_put_channels: + put_device(&mhi_dev->dev); /* DL channel reference */ + put_device(&mhi_dev->dev); /* UL channel reference */ + put_device(&mhi_dev->dev); /* device_initialize() reference */ return ret; } =20 --=20 2.43.0