diff options
| author | Ian Abbott <abbotti@mev.co.uk> | 2023-01-03 15:11:27 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-19 17:24:18 +0100 |
| commit | 863cf33255faa5834d4d4f9e5df8fba0518b2060 (patch) | |
| tree | f5f1b4de15462d420fc6acca06f49eae34ed99fc /drivers/comedi | |
| parent | 28ecbbae9ea459a0504e243668dae7c86eeedf9a (diff) | |
| download | linux-863cf33255faa5834d4d4f9e5df8fba0518b2060.tar.gz | |
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 <abbotti@mev.co.uk>
Link: https://lore.kernel.org/r/20230103151127.19287-1-abbotti@mev.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/comedi')
| -rw-r--r-- | drivers/comedi/comedi_fops.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/comedi/comedi_fops.c b/drivers/comedi/comedi_fops.c index e2114bcf815ad..b982903aaa465 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: |