mbox series

[v4,0/3] ASoC: soundwire: fix port_ready[] dynamic allocation

Message ID 20200831134318.11443-1-yung-chuan.liao@linux.intel.com (mailing list archive)
Headers show
Series ASoC: soundwire: fix port_ready[] dynamic allocation | expand

Message

Bard Liao Aug. 31, 2020, 1:43 p.m. UTC 
The existing code allocates memory for the total number of ports.
This only works if the ports are contiguous, but will break if e.g. a
Devices uses port0, 1, and 14. The port_ready[] array would contain 3
elements, which would lead to an out-of-bounds access. Conversely in
other cases, the wrong port index would be used leading to timeouts on
prepare.

This can be fixed by allocating for the worst-case of 15
ports (DP0..DP14). In addition since the number is now fixed, we can
use an array instead of a dynamic allocation.

Changes in v4:
- Reorder the patches order to allow bisect.

Changes in v3:
- Add ASoC tag in the cover letter title.
- Edit the title and commit message of the third patch for better
  understanding.

Changes in v2:
- Split patches into sdw and asoc patches. Please note that "soundwire:
  fix port_ready[] dynamic allocation in mipi_disco" and "ASoC: codecs:
  fix port_ready[] dynamic allocation in ASoC codecs" should be merged
  at the same time.


Pierre-Louis Bossart (3):
  ASoC: codecs: soundwire: remove port_ready[] usage from codecs.
  soundwire: add definition for maximum number of ports
  soundwire: fix port_ready[] dynamic allocation in mipi_disco

 drivers/soundwire/mipi_disco.c  | 18 +-----------------
 drivers/soundwire/slave.c       |  4 ++++
 include/linux/soundwire/sdw.h   |  5 +++--
 sound/soc/codecs/max98373-sdw.c | 15 +--------------
 sound/soc/codecs/rt1308-sdw.c   | 14 +-------------
 sound/soc/codecs/rt5682-sdw.c   | 15 +--------------
 sound/soc/codecs/rt700-sdw.c    | 15 +--------------
 sound/soc/codecs/rt711-sdw.c    | 15 +--------------
 sound/soc/codecs/rt715-sdw.c    | 33 +--------------------------------
 9 files changed, 14 insertions(+), 120 deletions(-)

Comments

Vinod Koul Sept. 3, 2020, 10:32 a.m. UTC | #1 
On 31-08-20, 21:43, Bard Liao wrote:
> The existing code allocates memory for the total number of ports.
> This only works if the ports are contiguous, but will break if e.g. a
> Devices uses port0, 1, and 14. The port_ready[] array would contain 3
> elements, which would lead to an out-of-bounds access. Conversely in
> other cases, the wrong port index would be used leading to timeouts on
> prepare.
> 
> This can be fixed by allocating for the worst-case of 15
> ports (DP0..DP14). In addition since the number is now fixed, we can
> use an array instead of a dynamic allocation.

Applied all, thanks