From 863cf33255faa5834d4d4f9e5df8fba0518b2060 Mon Sep 17 00:00:00 2001 From: Ian Abbott Date: Tue, 3 Jan 2023 15:11:27 +0000 Subject: comedi: check data length for INSN_CONFIG_GET_PWM_OUTPUT Comedi INSN_CONFIG instructions have different expected instructtion data lengths depending on the type of configuration instruction specified by the first word of data. This is checked by `check_insn_config_length()`. There are a few configuration instructions whose data lengths are not currently checked, usually for rare configuration instructions that are implemented differently by different drivers. For unknown configuration instructions, the function logs a warning and accepts the specified data length. The `INSN_CONFIG_GET_PWM_OUTPUT` configuration instruction length is not currently checked, but all the places it is currently used expect a data length of 3. (These places are `ni_get_pwm_config()` in "ni_mio_common.c", and `pci1760_pwm_insn_config()` in "adv_pci1760.c".) Make this length official by checking it in `check_insn_config_length()`. Signed-off-by: Ian Abbott Link: https://lore.kernel.org/r/20230103151127.19287-1-abbotti@mev.co.uk Signed-off-by: Greg Kroah-Hartman --- drivers/comedi/comedi_fops.c | 1 + 1 file changed, 1 insertion(+) (limited to 'drivers/comedi') diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c index e2114bcf815a..b982903aaa46 100644 --- a/drivers/comedi/comedi_fops.c +++ b/drivers/comedi/comedi_fops.c @@ -1215,6 +1215,7 @@ static int check_insn_config_length(struct comedi_insn *insn, case INSN_CONFIG_GET_CLOCK_SRC: case INSN_CONFIG_SET_OTHER_SRC: case INSN_CONFIG_GET_COUNTER_STATUS: + case INSN_CONFIG_GET_PWM_OUTPUT: case INSN_CONFIG_PWM_SET_H_BRIDGE: case INSN_CONFIG_PWM_GET_H_BRIDGE: case INSN_CONFIG_GET_HARDWARE_BUFFER_SIZE: -- cgit v1.2.3