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Message-ID: <20231107232503.3776802-1-sashal@kernel.org>
Date: Tue, 7 Nov 2023 18:24:56 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Yi Yang <yiyang13@...wei.com>, Jiri Slaby <jirislaby@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
sparclinux@...r.kernel.org, linux-serial@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 1/5] tty: vcc: Add check for kstrdup() in vcc_probe()
From: Yi Yang <yiyang13@...wei.com>
[ 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@...wei.com>
Reviewed-by: Jiri Slaby <jirislaby@...nel.org>
Link: https://lore.kernel.org/r/20230904035220.48164-1-yiyang13@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
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 9ffd42e333b83..6b2d35ac6e3b3 100644
--- a/drivers/tty/vcc.c
+++ b/drivers/tty/vcc.c
@@ -587,18 +587,22 @@ 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);
@@ -632,6 +636,11 @@ 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);
@@ -661,8 +670,9 @@ 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;
--
2.42.0
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