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🟢 Approval recommended
The focused bounds check and fade guards address the unsafe accesses and division without identified blocking issues.
No open issues 🎉
What changed in this PR
Hardens copier initialization against undersized DMIC gateway blobs and zero-length fades.
Changes:
- Rejects DMIC blobs that do not contain the global configuration before reading fade and silence parameters.
- Prevents division by zero in both fade implementations when the calculated fade length is zero.
| File | Description |
|---|---|
| src/audio/copier/copier_hifi.c | Skips fade-step calculation for zero-length fades. |
| src/audio/copier/copier_generic.c | Adds the same zero-length guard to the generic implementation. |
| src/audio/copier/copier_gain.c | Validates DMIC blob length before accessing global configuration. |
Review effort: Balanced
copier_gain_set_params() casts the copier gateway blob to a struct
dmic_config_data and reads the fade-in and silence periods from its
global config, 20 bytes into the blob. The blob is copied into the
copier instance with the host-supplied gtw_cfg.config_length (in
dwords), and nothing required that length to cover the global config:
ipc4_find_dma_config() only looks for a DMA-config TLV.
An IPC4 INIT_INSTANCE for a copier with a DMIC link input gateway and
config_length = 0 therefore reads past the end of the instance
allocation. ASan reports it on native_sim as:
use-after-poison ... READ of size 4
copier_gain_set_params src/audio/copier/copier_gain.c:43
copier_dai_init src/audio/copier/copier_dai.c:262
copier_dai_create src/audio/copier/copier_dai.c:380
copier_init src/audio/copier/copier.c:237
Require the blob to be at least as long as the global config before
dereferencing it, and reject the malformed gateway configuration
otherwise.
Assisted-by: Copilot:claude-opus-4.8
Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>
copier_gain_set_fade_params() divides INT64_MAX by fade_sg_length, which is computed as frames * fade_period where frames is the host-supplied sampling frequency divided by the pipeline period and fade_period comes from the DMIC gateway blob. Both inputs are host-controlled, so the product can be zero: a DMIC copier created with a sampling frequency below the pipeline period rate makes frames zero and the division faults (SIGFPE in __udivdi3, reported by ASan as "FPE on unknown address"). A zero fade length simply means no fade segment, which is already the documented behaviour of the GAIN_ZERO_TRANS_MS case just above, so return early with the fade disabled instead of computing a step for it. Apply the same guard to the generic and HiFi implementations. Found while verifying a well-formed DMIC gateway blob against the preceding blob-length fix on an IPC4 + ASan native_sim build. Assisted-by: Copilot:claude-opus-4.8 Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>
PR 11367: test resultsRun date: 2026-10-27 15:33 UTC Tested commit: 00ed003d2693e7c115ec16a6b5b98a8b6bc8b0f6
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copier_gain_set_params() casts the copier gateway blob to a struct
dmic_config_data and reads the fade-in and silence periods from its
global config, 20 bytes into the blob. The blob is copied into the
copier instance with the host-supplied gtw_cfg.config_length (in
dwords), and nothing required that length to cover the global config:
ipc4_find_dma_config() only looks for a DMA-config TLV.
An IPC4 INIT_INSTANCE for a copier with a DMIC link input gateway and
config_length = 0 therefore reads past the end of the instance
allocation. ASan reports it on native_sim as:
Require the blob to be at least as long as the global config before
dereferencing it, and reject the malformed gateway configuration
otherwise.
Assisted-by: Copilot:claude-opus-4.8