[PATCH v2 0/5] ASoC: fsl_asrc/fsl_easrc: fix memory safety issues

[Stefan Ghetu]

This series fixes memory safety issues in the ASRC and EASRC drivers
that can be triggered by a user with access to their PCM or compress
devices:

1. fsl_asrc_m2m: the output FIFO drain can write past the end of the
   output buffer.
2. fsl_asrc: a repeated hw_params() leaves a stale asrc->pair[] entry
   that points to freed memory after close, and hw_free() after a
   failed hw_params() can release the pair of another stream.
3. fsl_asrc_dma: DMA channels are leaked on a repeated hw_params(), and
   released twice after a Back-End configuration error.
4. fsl_easrc: the same repeated hw_params() issue for EASRC contexts.
5. fsl_asrc_m2m: more than one task per compress stream leads to double
   DMA channel release and a stale pair entry.

Patches 2 and 4 make the pair/context release ownership-checked; patch
5 relies on them. Please apply in order.

Validated on i.MX8MP (EASRC) and i.MX8QM (ASRC).

Changes since v1:
- Patch 1: drop the 8-bit output path, ASRC does not support 8-bit
  output (Shengjiu Wang).
- Patches 2-5: add Reviewed-by tags, no code changes.

v1: https://lore.kernel.org/linux-sound/20261110120743.6301-1-stefan.ghetu@xxxxxxx/T/

Stefan Ghetu (5):
  ASoC: fsl_asrc_m2m: fix out-of-bounds write when draining the output
    FIFO
  ASoC: fsl_asrc: fix pair ownership on repeated or failed hw_params
  ASoC: fsl_asrc_dma: release DMA channels on repeated hw_params
  ASoC: fsl_easrc: fix context ownership on repeated hw_params
  ASoC: fsl_asrc_m2m: allow only one task at a time per stream

 sound/soc/fsl/fsl_asrc.c     | 22 ++++++++++++++++++++++
 sound/soc/fsl/fsl_asrc_dma.c | 27 ++++++++++++++++++---------
 sound/soc/fsl/fsl_asrc_m2m.c | 30 +++++++++++++++++++-----------
 sound/soc/fsl/fsl_easrc.c    | 10 ++++++++++
 4 files changed, 69 insertions(+), 20 deletions(-)


base-commit: b810335a0699d1810683796b0e3ffe8827ddfe6c
-- 
2.34.1