From: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
[ Upstream commit 23ae34e033b2c0e5e88237af82b163b296fd6aa9 ]
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@xxxxxxxxx>
Fixes: f14a1c5a9f83 ("ASoC: Intel: avs: Add module management requests")
Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
Link: https://lore.kernel.org/r/20221010121955.718168-3-cezary.rojewski@xxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
sound/soc/intel/avs/ipc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/sound/soc/intel/avs/ipc.c b/sound/soc/intel/avs/ipc.c
index 020d85c7520d..77da206f7dbb 100644
--- a/sound/soc/intel/avs/ipc.c
+++ b/sound/soc/intel/avs/ipc.c
@@ -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);
--
2.35.1
