audio: copier: fix channel and memcpy validation#10897
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channels is host-controlled (8-bit, 0-255). Without validation it drives the memcpy length (channels * sizeof(uint16_t)) against a MAX_GAIN_COEFFS_CNT-sized stack buffer and, for channels == 0, causes divide-by-zero in the coefficient replication loop. Reject values outside [1, MAX_GAIN_COEFFS_CNT]. Signed-off-by: Adrian Bonislawski <adrian.bonislawski@intel.com>
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Pull request overview
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Copilot was unable to run its full agentic suite in this review.
Updates copier gain DMA control to use an unsigned channel count, adds explicit channel-count validation, and fixes memcpy_s destination size validation to prevent incorrect bounds checking.
Changes:
- Switch
channelsparameter/type frominttouint32_tfor copier gain configuration. - Add runtime validation for
channels(non-zero and withinMAX_GAIN_COEFFS_CNT). - Correct
memcpy_susage by passing the full destination buffer size.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| src/audio/copier/copier_gain.h | Updates copier_set_gain() API to take uint32_t channels. |
| src/audio/copier/copier_gain.c | Uses uint32_t channels, validates range, and fixes memcpy_s destination size argument. |
The first memcpy_s call passed gain_coef_size (= channels * sizeof(uint16_t), host-controlled) as the dest_size argument, defeating the bounds check. Pass sizeof(static_gain) — the true buffer capacity so memcpy_s can enforce the limit. Signed-off-by: Adrian Bonislawski <adrian.bonislawski@intel.com>
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lgirdwood
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Jun 12, 2026
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