ASoC: Intel: avs: Shield LARGE_CONFIG_GETs against zero payload_size

Some LARGE_CONFIG_GETs are never expected to return payload of size 0.
Check for such situation and collapse if met.

Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://lore.kernel.org/r/20220707124153.1858249-6-cezary.rojewski@intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/intel/avs/messages.c b/sound/soc/intel/avs/messages.c
index 3559fb496e0bfb7a03a4539b6543faee4ce00969..9cf621eaec5aa3a63d2281720cdb581b649da1d9 100644 (file)
--- a/sound/soc/intel/avs/messages.c
+++ b/sound/soc/intel/avs/messages.c
@@ -474,6 +474,9 @@ int avs_ipc_get_fw_config(struct avs_dev *adev, struct avs_fw_cfg *cfg)
                                       &payload, &payload_size);
        if (ret)
                return ret;
+       /* Non-zero payload expected for FIRMWARE_CONFIG. */
+       if (!payload_size)
+               return -EREMOTEIO;
 
        while (offset < payload_size) {
                tlv = (struct avs_tlv *)(payload + offset);
@@ -587,6 +590,9 @@ int avs_ipc_get_hw_config(struct avs_dev *adev, struct avs_hw_cfg *cfg)
                                       &payload, &payload_size);
        if (ret)
                return ret;
+       /* Non-zero payload expected for HARDWARE_CONFIG. */
+       if (!payload_size)
+               return -EREMOTEIO;
 
        while (offset < payload_size) {
                tlv = (struct avs_tlv *)(payload + offset);
@@ -670,6 +676,9 @@ int avs_ipc_get_modules_info(struct avs_dev *adev, struct avs_mods_info **info)
                                       &payload, &payload_size);
        if (ret)
                return ret;
+       /* Non-zero payload expected for MODULES_INFO. */
+       if (!payload_size)
+               return -EREMOTEIO;
 
        *info = (struct avs_mods_info *)payload;
        return 0;