diff mbox series

[5.16,0395/1039] HID: hid-uclogic-params: Invalid parameter check in uclogic_params_get_str_desc

Message ID 20220124184138.598227098@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Jan. 24, 2022, 6:36 p.m. UTC 
From: José Expósito <jose.exposito89@gmail.com>

[ Upstream commit 0a94131d6920916ccb6a357037c535533af08819 ]

The function performs a check on the hdev input parameters, however, it
is used before the check.

Initialize the udev variable after the sanity check to avoid a
possible NULL pointer dereference.

Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443827 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hid/hid-uclogic-params.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
index 3c10b858cf74c..3a83e2c39b4fb 100644
--- a/drivers/hid/hid-uclogic-params.c
+++ b/drivers/hid/hid-uclogic-params.c
@@ -66,7 +66,7 @@  static int uclogic_params_get_str_desc(__u8 **pbuf, struct hid_device *hdev,
 					__u8 idx, size_t len)
 {
 	int rc;
-	struct usb_device *udev = hid_to_usb_dev(hdev);
+	struct usb_device *udev;
 	__u8 *buf = NULL;
 
 	/* Check arguments */
@@ -75,6 +75,8 @@  static int uclogic_params_get_str_desc(__u8 **pbuf, struct hid_device *hdev,
 		goto cleanup;
 	}
 
+	udev = hid_to_usb_dev(hdev);
+
 	buf = kmalloc(len, GFP_KERNEL);
 	if (buf == NULL) {
 		rc = -ENOMEM;