ASoC: SOF: control: fix size checks for ext_bytes control .get()

cppcheck complains twice:

sound/soc/sof/control.c:436:2: style: Assignment of function parameter
has no effect outside the function. [uselessAssignmentArg]
 size -= sizeof(const struct snd_ctl_tlv);
 ^

sound/soc/sof/control.c:436:7: style: Variable 'size' is assigned a
value that is never used. [unreadVariable]
 size -= sizeof(const struct snd_ctl_tlv);

Somehow we dropped the checks for the size argument when upstreaming
the code, somewhere between v5 and v6.

Re-add a size check to avoid providing userspace with more data that
it asked for.

Also fix all error codes, we should return -ENOSPC instead of -EINVAL.

Fixes: c3078f5397046 ('ASoC: SOF: Add Sound Open Firmware KControl support')
Signed-off-by: Pierre-Louis Bossart <[email protected]>
Reviewed-by: Ranjani Sridharan <[email protected]>
Reviewed-by: Guennadi Liakhovetski <[email protected]>
Signed-off-by: Kai Vehmanen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

0 files changed, 0 insertions, 0 deletions