diff options
| author | José Expósito <jose.exposito89@gmail.com> | 2022-01-05 20:29:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-01-27 13:03:54 +0300 |
| commit | 621aade97324398e74e8cd921fc02fc015e1d606 (patch) | |
| tree | e9ec6725d72b99715d5b6f1f5e214ede04b9889f /drivers/hid | |
| parent | 78e8660e9d909702d5d17660c46360bcd57e80ba (diff) | |
| download | linux-621aade97324398e74e8cd921fc02fc015e1d606.tar.xz | |
HID: hid-uclogic-params: Invalid parameter check in uclogic_params_init
[ Upstream commit f364c571a5c77e96de2d32062ff019d6b8d2e2bc ]
The function performs a check on its input parameters, however, the
hdev parameter is used before the check.
Initialize the stack variables after checking the input parameters to
avoid a possible NULL pointer dereference.
Fixes: 9614219e9310e ("HID: uclogic: Extract tablet parameter discovery into a module")
Addresses-Coverity-ID: 1443831 ("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>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hid-uclogic-params.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c index adff1bd68d9f..3c10b858cf74 100644 --- a/drivers/hid/hid-uclogic-params.c +++ b/drivers/hid/hid-uclogic-params.c @@ -834,10 +834,10 @@ int uclogic_params_init(struct uclogic_params *params, struct hid_device *hdev) { int rc; - struct usb_device *udev = hid_to_usb_dev(hdev); - __u8 bNumInterfaces = udev->config->desc.bNumInterfaces; - struct usb_interface *iface = to_usb_interface(hdev->dev.parent); - __u8 bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber; + struct usb_device *udev; + __u8 bNumInterfaces; + struct usb_interface *iface; + __u8 bInterfaceNumber; bool found; /* The resulting parameters (noop) */ struct uclogic_params p = {0, }; @@ -848,6 +848,11 @@ int uclogic_params_init(struct uclogic_params *params, goto cleanup; } + udev = hid_to_usb_dev(hdev); + bNumInterfaces = udev->config->desc.bNumInterfaces; + iface = to_usb_interface(hdev->dev.parent); + bInterfaceNumber = iface->cur_altsetting->desc.bInterfaceNumber; + /* * Set replacement report descriptor if the original matches the * specified size. Otherwise keep interface unchanged. |