[PATCH OLK-6.6 118/525] tty: vcc: Add check for kstrdup() in vcc_probe()

From: Yi Yang yiyang13@huawei.com

stable inclusion from stable-v6.6.3 commit 8f8771757b130383732195497e47fba2aba76d3a category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8LBQP

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: Zheng Zengkai zhengzengkai@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 a39ed981bfd3..5b625f20233b 100644 --- a/drivers/tty/vcc.c +++ b/drivers/tty/vcc.c @@ -579,18 +579,22 @@ 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);

@@ -624,6 +628,11 @@ 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);

@@ -653,8 +662,9 @@ 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;