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ASoC: Intel: avs: Fix potential RX buffer overflow

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If an event caused firmware to return invalid RX size for
LARGE_CONFIG_GET, memcpy_fromio() could end up copying too many bytes.
Fix by utilizing min_t().

Reported-by: CoolStar <coolstarorganization@gmail.com>
Fixes: f14a1c5a9f83 ("ASoC: Intel: avs: Add module management requests")
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20221010121955.718168-3-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Cezary Rojewski 2022-10-10 14:19:42 +02:00 committed by Mark Brown
parent 83375566a7
commit 23ae34e033
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GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 1 deletions
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3
sound/soc/intel/avs/ipc.c
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@ -192,7 +192,8 @@ static void avs_dsp_receive_rx(struct avs_dev *adev, u64 header)
/* update size in case of LARGE_CONFIG_GET */
if (msg.msg_target == AVS_MOD_MSG &&
msg.global_msg_type == AVS_MOD_LARGE_CONFIG_GET)
ipc->rx.size = msg.ext.large_config.data_off_size;
ipc->rx.size = min_t(u32, AVS_MAILBOX_SIZE,
msg.ext.large_config.data_off_size);
memcpy_fromio(ipc->rx.data, avs_uplink_addr(adev), ipc->rx.size);
trace_avs_msg_payload(ipc->rx.data, ipc->rx.size);