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([223.80.110.53]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-364bdf2ac19sm21648683a91.3.2026.05.05.02.12.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2026 02:12:44 -0700 (PDT) From: Guangshuo Li To: Luis Chamberlain , Russ Weight , Danilo Krummrich , Greg Kroah-Hartman , "Rafael J. Wysocki" , Tianfei zhang , driver-core@lists.linux.dev, linux-kernel@vger.kernel.org Cc: Guangshuo Li , stable@vger.kernel.org Subject: [PATCH v3] firmware_loader: fix device reference leak in firmware_upload_register() Date: Tue, 5 May 2026 17:12:31 +0800 Message-ID: <20260505091231.607089-1-lgs201920130244@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" firmware_upload_register() -> fw_create_instance() -> device_initialize() After fw_create_instance() succeeds, the lifetime of the embedded struct device is expected to be managed through the device core reference counting, since fw_create_instance() has already called device_initialize(). In firmware_upload_register(), if alloc_lookup_fw_priv() fails after fw_create_instance() succeeds, the code reaches free_fw_sysfs and frees fw_sysfs directly instead of releasing the device reference with put_device(). This may leave the reference count of the embedded struct device unbalanced, resulting in a refcount leak. The issue was identified by a static analysis tool I developed and confirmed by manual review. Fix this by using put_device(fw_dev) in the failure path and letting fw_dev_release() handle the final cleanup, instead of freeing the instance directly from the error path. Fixes: 97730bbb242c ("firmware_loader: Add firmware-upload support") Cc: stable@vger.kernel.org Signed-off-by: Guangshuo Li --- v3: - Move fw_sysfs->fw_upload_priv assignment after fw_sysfs->fw_priv is initialized, so the alloc_lookup_fw_priv() failure path does not enter fw_upload_free() with an uninitialized fw_sysfs->fw_priv. - On alloc_lookup_fw_priv() failure, call put_device(fw_dev) and then free fw_upload_priv and fw_upload explicitly. v2: - Remove the free_fw_sysfs label. - Call put_device(fw_dev) directly in the alloc_lookup_fw_priv() failure path and jump to exit_module_put. drivers/base/firmware_loader/sysfs_upload.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/base/firmware_loader/sysfs_upload.c b/drivers/base/fir= mware_loader/sysfs_upload.c index f59a7856934c..efc33294212f 100644 --- a/drivers/base/firmware_loader/sysfs_upload.c +++ b/drivers/base/firmware_loader/sysfs_upload.c @@ -343,7 +343,6 @@ firmware_upload_register(struct module *module, struct = device *parent, goto free_fw_upload_priv; } fw_upload->priv =3D fw_sysfs; - fw_sysfs->fw_upload_priv =3D fw_upload_priv; fw_dev =3D &fw_sysfs->dev; =20 ret =3D alloc_lookup_fw_priv(name, &fw_cache, &fw_priv, NULL, 0, 0, @@ -351,10 +350,12 @@ firmware_upload_register(struct module *module, struc= t device *parent, if (ret !=3D 0) { if (ret > 0) ret =3D -EINVAL; - goto free_fw_sysfs; + put_device(fw_dev); + goto free_fw_upload_priv; } fw_priv->is_paged_buf =3D true; fw_sysfs->fw_priv =3D fw_priv; + fw_sysfs->fw_upload_priv =3D fw_upload_priv; =20 ret =3D device_add(fw_dev); if (ret) { @@ -365,9 +366,6 @@ firmware_upload_register(struct module *module, struct = device *parent, =20 return fw_upload; =20 -free_fw_sysfs: - kfree(fw_sysfs); - free_fw_upload_priv: kfree(fw_upload_priv); =20 --=20 2.43.0