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HID: hid-uclogic-params: Invalid parameter check in uclogic_params_get_str_desc

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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: 9614219e93 ("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>
This commit is contained in:
José Expósito 2022-01-05 18:29:13 +01:00 committed by Jiri Kosina
parent f364c571a5
commit 0a94131d69
1 changed files with 3 additions and 1 deletions
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4
drivers/hid/hid-uclogic-params.c
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@ -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;