stable inclusion from stable-v4.19.300 commit 909963e0c16778cec28efb1affc21558825f4200 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFK8 CVE: CVE-2023-52789

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit d81ffb87aaa75f842cd7aa57091810353755b3e6 ]

Add check for the return value of kstrdup() and return the error, if it fails in order to avoid NULL pointer dereference.

Signed-off-by: Yi Yang yiyang13@huawei.com Reviewed-by: Jiri Slaby jirislaby@kernel.org Link: https://lore.kernel.org/r/20230904035220.48164-1-yiyang13@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yi Yang yiyang13@huawei.com --- drivers/tty/vcc.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/vcc.c b/drivers/tty/vcc.c index 58b454c34560..73dae8902216 100644 --- a/drivers/tty/vcc.c +++ b/drivers/tty/vcc.c @@ -586,18 +586,22 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id) return -ENOMEM;

name = kstrdup(dev_name(&vdev->dev), GFP_KERNEL); + if (!name) { + rv = -ENOMEM; + goto free_port; + }

rv = vio_driver_init(&port->vio, vdev, VDEV_CONSOLE_CON, vcc_versions, ARRAY_SIZE(vcc_versions), NULL, name); if (rv) - goto free_port; + goto free_name;

port->vio.debug = vcc_dbg_vio; vcc_ldc_cfg.debug = vcc_dbg_ldc;

rv = vio_ldc_alloc(&port->vio, &vcc_ldc_cfg, port); if (rv) - goto free_port; + goto free_name;

spin_lock_init(&port->lock);

@@ -630,6 +634,11 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id) goto unreg_tty; } port->domain = kstrdup(domain, GFP_KERNEL); + if (!port->domain) { + rv = -ENOMEM; + goto unreg_tty; + } +

mdesc_release(hp);

@@ -659,8 +668,9 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id) vcc_table_remove(port->index); free_ldc: vio_ldc_free(&port->vio); -free_port: +free_name: kfree(name); +free_port: kfree(port);

return rv;