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authorIan Abbott <abbotti@mev.co.uk>2023-01-03 15:11:27 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-01-19 17:24:18 +0100
commit863cf33255faa5834d4d4f9e5df8fba0518b2060 (patch)
treef5f1b4de15462d420fc6acca06f49eae34ed99fc /drivers/comedi
parent28ecbbae9ea459a0504e243668dae7c86eeedf9a (diff)
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.c1
1 files changed, 1 insertions, 0 deletions
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: