6.6-stable review patch. If anyone has any objections, please let me know.
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From: Aleksa Savic savicaleksa83@gmail.com
[ Upstream commit e0cd85dc666cb08e1bd313d560cb4eff4d04219e ]
Introduce cmd_buffer, a separate buffer for storing only the command that is sent to the device. Before this separation, the existing buffer was shared for both the command and the report received in ccp_raw_event(), which was copied into it.
However, because of hidraw, the raw event parsing may be triggered in the middle of sending a command, resulting in outputting gibberish to the device. Using a separate buffer resolves this.
Fixes: 40c3a4454225 ("hwmon: add Corsair Commander Pro driver") Signed-off-by: Aleksa Savic savicaleksa83@gmail.com Acked-by: Marius Zachmann mail@mariuszachmann.de Link: https://lore.kernel.org/r/20240504092504.24158-2-savicaleksa83@gmail.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwmon/corsair-cpro.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/hwmon/corsair-cpro.c b/drivers/hwmon/corsair-cpro.c index 463ab4296ede5..34136d1b04764 100644 --- a/drivers/hwmon/corsair-cpro.c +++ b/drivers/hwmon/corsair-cpro.c @@ -79,6 +79,7 @@ struct ccp_device { struct device *hwmon_dev; struct completion wait_input_report; struct mutex mutex; /* whenever buffer is used, lock before send_usb_cmd */ + u8 *cmd_buffer; u8 *buffer; int target[6]; DECLARE_BITMAP(temp_cnct, NUM_TEMP_SENSORS); @@ -111,15 +112,15 @@ static int send_usb_cmd(struct ccp_device *ccp, u8 command, u8 byte1, u8 byte2, unsigned long t; int ret;
- memset(ccp->buffer, 0x00, OUT_BUFFER_SIZE); - ccp->buffer[0] = command; - ccp->buffer[1] = byte1; - ccp->buffer[2] = byte2; - ccp->buffer[3] = byte3; + memset(ccp->cmd_buffer, 0x00, OUT_BUFFER_SIZE); + ccp->cmd_buffer[0] = command; + ccp->cmd_buffer[1] = byte1; + ccp->cmd_buffer[2] = byte2; + ccp->cmd_buffer[3] = byte3;
reinit_completion(&ccp->wait_input_report);
- ret = hid_hw_output_report(ccp->hdev, ccp->buffer, OUT_BUFFER_SIZE); + ret = hid_hw_output_report(ccp->hdev, ccp->cmd_buffer, OUT_BUFFER_SIZE); if (ret < 0) return ret;
@@ -492,7 +493,11 @@ static int ccp_probe(struct hid_device *hdev, const struct hid_device_id *id) if (!ccp) return -ENOMEM;
- ccp->buffer = devm_kmalloc(&hdev->dev, OUT_BUFFER_SIZE, GFP_KERNEL); + ccp->cmd_buffer = devm_kmalloc(&hdev->dev, OUT_BUFFER_SIZE, GFP_KERNEL); + if (!ccp->cmd_buffer) + return -ENOMEM; + + ccp->buffer = devm_kmalloc(&hdev->dev, IN_BUFFER_SIZE, GFP_KERNEL); if (!ccp->buffer) return -ENOMEM;