linux-kernel - [PATCH v3 0/3] ASoC: soundwire: fix port

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Message-Id: <20200830132742.20404-1-yung-chuan.liao@linux.intel.com>
Date:   Sun, 30 Aug 2020 21:27:39 +0800
From:   Bard Liao <yung-chuan.liao@...ux.intel.com>
To:     alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, linux-kernel@...r.kernel.org, tiwai@...e.de,
        broonie@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        srinivas.kandagatla@...aro.org, rander.wang@...ux.intel.com,
        ranjani.sridharan@...ux.intel.com, hui.wang@...onical.com,
        pierre-louis.bossart@...ux.intel.com, sanyog.r.kale@...el.com,
        mengdong.lin@...el.com, bard.liao@...el.com
Subject: [PATCH v3 0/3] ASoC: soundwire: fix port_ready[] dynamic allocation

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

 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(-)

-- 
2.17.1