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drivers: sensor: fcx_mldx5: Fix potential buffer overflow in UART frame #92992

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Merged
merged 1 commit into from
Jul 25, 2025
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drivers: sensor: fcx_mldx5: Fix potential buffer overflow in UART frame #92992

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10 changes: 8 additions & 2 deletions drivers/sensor/fcx_mldx5/fcx_mldx5.c
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Original file line number Diff line number Diff line change
Expand Up @@ -235,8 +235,14 @@ static void fcx_mldx5_uart_send(const struct device *dev, enum fcx_mldx5_cmd cmd

buf[FCX_MLDX5_STX_INDEX] = FCX_MLDX5_STX;
memcpy(&buf[FCX_MLDX5_CMD_INDEX], fcx_mldx5_cmds[cmd], FCX_MLDX5_CMD_LEN);
if (cmd_data_len != 0 && cmd_data_len == fcx_mldx5_cmds_data_len[cmd]) {
memcpy(&buf[FCX_MLDX5_DATA_INDEX], cmd_data, strlen(cmd_data));

if (cmd_data_len != 0) {
if ((FCX_MLDX5_DATA_INDEX + cmd_data_len) <= FCX_MLDX5_MAX_FRAME_LEN) {
memcpy(&buf[FCX_MLDX5_DATA_INDEX], cmd_data, cmd_data_len);
} else {
LOG_ERR("%s: cmd_data too large for buffer", __func__);
return;
}
}

checksum = fcx_mldx5_calculate_checksum(&buf[FCX_MLDX5_CMD_INDEX],
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